MR. CHIEF JUSTICE WARREN delivered the opinion of the Court.Petitioner is a practitioner registered to practice before the United States Patent Office.  He has not been admitted to practice law before the Florida or any other bar.  Alleging, among other things, that petitioner"is engaged in the unauthorized practice of law, in that, although he is not a member of The Florida Bar, he nevertheless maintains an office . . . in Tampa, Florida, . . . holds himself out to the public as a Patent Attorney . . . represents Florida clients before the United States Patent Office, . . . has rendered opinions as to patentability, and . . . has prepared various legal instruments, including . . . applications and amendments to applications for letters patent, and filed same in the United States Patent Office in Washington, D.C.,"the Florida Bar instituted these proceedings in the Supreme Court of Florida to enjoin the performance of these and other specified acts within the State.  Petitioner filed an answer in which he admitted the above allegations, but pleaded as a defense"that the work performed by him for Florida citizens is solely that work which is presented to the United States Patent Office, and that he charges fees solely for his work Page 373 U. S. 382 of preparing and prosecuting patent applications and patent assignments and determinations incident to preparing and prosecuting patent applications and assignments."Thereupon, the court granted the Bar's motion for a summary decree and permanently enjoined the petitioner from pursuing the following activities in Florida until and unless he became a member of the State Bar:"1. using the term 'patent attorney' or holding himself out to be an attorney at law in this state in any field or phase of the law (we recognize that the respondent, according to the record before us, has already voluntarily ceased the use of the word 'attorney');""2. rendering legal opinions, including opinions as to patentability or infringement on patent rights;""3. preparing, drafting and construing legal documents;""4. holding himself out, in this state, as qualified to prepare and prosecute applications for letters patent, and amendments thereto;""5. preparation and prosecution of applications for letters patent, and amendments thereto, in this state; and""6. otherwise engaging in the practice of law."The Supreme Court of Florida concluded that petitioner's conduct constituted the unauthorized practice of law which the State, acting under its police power, could properly prohibit, and that neither federal statute nor the Constitution of the United States empowered any federal body to authorize such conduct in Florida.  140 So. 2d 587.In his petition for certiorari, petitioner attacked the injunction"only insofar as it prohibits him from engaging in the specific activities . . . [referred to above], covered by his federal license to practice before the Patent Office.  He does not claim that he has any right otherwise to Page 373 U. S. 383 engage in activities that would be regarded as the practice of law. [Footnote 1]"We granted certiorari, 371 U.S. 875, to consider the significant, but narrow, questions thus presented.We do not question the determination that, under Florida law, the preparation and prosecution of patent applications for others constitutes the practice of law.  Greenough v. Tax Assessors, 331 U. S. 486; Murdock v. Memphis, 20 Wall. 590.  Such conduct inevitably requires the practitioner to consider and advise his clients as to the patentability of their inventions under the statutory criteria, 35 U.S.C. §§ 101-103, 161, 171, as well as to consider the advisability of relying upon alternative forms of protection which may be available under statute law.  It also involves his participation in the drafting of the specification and claims of the patent application, 35 U.S.C. § 112, which this Court long ago noted "constitute[s] one of the most difficult legal instruments to draw with accuracy,"  Topliff v. Topliff, 145 U. S. 156,  145 U. S. 171.  And, upon rejection of the application, the practitioner may also assist in the preparation of amendments, 37 CFR §§ 1.117-1.126, which frequently requires written argument to establish the patentability of the claimed invention under the applicable rules of law and in light of the prior art.  37 CFR § 1.119.  Nor do we doubt that Florida has a substantial interest in regulating the practice of law within the State, and that, in the absence of federal legislation, it could validly prohibit nonlawyers from engaging in this circumscribed form of patent practice. [Footnote 2] Page 373 U. S. 384But "the law of the State, though enacted in the exercise of powers not controverted, must yield" when incompatible with federal legislation.  Gibbons v. Ogden, 9 Wheat. 1,  22 U. S. 211.  Congress has provided that the Commissioner of Patents"may prescribe regulations governing the recognition and conduct of agents, attorneys, or other persons representing applicants or other parties before the Patent Office,"35 U.S.C. § 31, [Footnote 3] and the Commissioner, pursuant to § 31, has provided by regulation that"[a]n applicant for patent . . . may be represented by an attorney or agent authorized to practice before the Patent Office in patent cases."37 CFR § 1.31.  (Emphasis added.)  The current regulations establish two separate registers"on which are entered the names of all persons recognized as entitled to represent applicants before the Patent Office in the preparation and prosecution of applications for patent."37 CFR § 1.341.  (Emphasis added.)  One register is for attorneys at law, 37 CFR § 1.341(a), and the other is for nonlawyer "agents."  37 CFR § 1.341(b).  A person may be admitted under either category only by establishing"that he is of good moral character and of good repute and possessed of the legal and scientific and technical qualifications necessary to enable him to render applicants for patents valuable service, and is otherwise competent to advise and assist them Page 373 U. S. 385 in the presentation and prosecution of their applications before the Patent Office."37 CFR § 1.341(c).The statute thus expressly permits the Commissioner to authorize practice before the Patent Office by nonlawyers, and the Commissioner has explicitly granted such authority.  If the authorization is unqualified, then, by virtue of the Supremacy Clause, Florida may not deny to those failing to meet its own qualifications the right to perform the functions within the scope of the federal authority.  A State may not enforce licensing requirements which, though valid in the absence of federal regulation, give "the State's licensing board a virtual power of review over the federal determination" that a person or agency is qualified and entitled to perform certain functions, [Footnote 4] or which impose upon the performance of activity sanctioned by federal license additional conditions not contemplated by Congress. [Footnote 5]  "No State law can hinder or obstruct the free use of a license granted under an act of Congress."  Pennsylvania v. Wheeling & Belmont Bridge Co., 13 How. 518,  54 U. S. 566.Respondent argues, however, that we must read into the authorization conferred by the federal statute and regulations the condition that such practice not be inconsistent with state law, thus leaving registered practitioners with the unqualified right to practice only in the physical presence of the Patent Office and in the District of Columbia, where the Office is now located. Page 373 U. S. 386The only language in either the statute or regulations which affords any plausible support for this view is the provision in the regulations that "[r]egistration in the Patent Office . . . shall only entitle the persons registered to practice before the Patent Office."  37 CFR § 1.341.  Respondent suggests that the meaning of this limitation is clarified by reference to the predecessor provision, which provided that registration "shall not be construed as authorizing persons not members of the bar to practice law."  3 Fed.Reg. 2429.  Yet the progression to the more circumscribed language, without more, tends to indicate that the provision was intended only to emphasize that registration in the Patent Office does not authorize the general practice of patent law, but sanctions only the performance of those services which are reasonably necessary and incident to the preparation and prosecution of patent applications.  That no more was intended is further shown by the contrast with the regulations governing practice before the Patent Office in trademark cases, also issued by the Commissioner of Patents.  These regulations now provide that"[r]ecognition of any person under this section is not to be construed as sanctioning or authorizing the performance of any acts regarded in the jurisdiction where performed as the unauthorized practice of law."37 CFR § 2.12(d).  The comparison is perhaps sufficiently telling.  But any possible uncertainty as to the intended meaning of the Commissioner must be dispelled by the fact that, when the present regulations were amended in 1948, [Footnote 6] it was first proposed to add a provision similar to that appearing in the trademark regulations. [Footnote 7]  After objection had been leveled Page 373 U. S. 387 against the revision on the ground that it"indicated that the office thinks that the states have the power to circumscribe and limit the rights of patent attorneys who are not lawyers, [Footnote 8]"the more sweeping language was deleted and the wording modified to its present form.Bereft of support in the regulations, respondent directs us to the legislative history of the statute to confirm its understanding that § 31 and its predecessor provisions were not designed to authorize practice not condoned by the State.  Insofar as this history provides any insight Page 373 U. S. 388 into the intent of Congress, however, we are convinced that the interpretation which respondent asks us to give the statute is inconsistent with the assumptions upon which Congress has acted for over a century.Examination of the development of practice before the Patent Office and its governmental regulation reveals that:  (1) nonlawyers have practiced before the Office from its inception, with the express approval of the Patent Office and to the knowledge of Congress; (2) during prolonged congressional study of unethical practices before the Patent Office, the right of nonlawyer agents to practice before the Office went unquestioned, and there was no suggestion that abuses might be curbed by state regulation; (3) despite protests of the bar, Congress, in enacting the Administrative Procedure Act, refused to limit the right to practice before the administrative agencies to lawyers; and (4) the Patent Office has defended the value of nonlawyer practitioners while taking steps to protect the interests which a State has in prohibiting unauthorized practice of law.  We find implicit in this history congressional (and administrative) recognition that registration in the Patent Office confers a right to practice before the Office without regard to whether the State within which the practice is conducted would otherwise prohibit such conduct.The power of the Commissioner of Patents to regulate practice before the Patent Office dates back to 1861, when Congress first provided that, "for gross misconduct he may refuse to recognize any person as a patent agent, either generally or in any particular case. . . ." [Footnote 9]  The "Rules and Directions" issued by the Commissioner in 1869 provided that"[a]ny person of intelligence and good moral character may appear as the attorney in fact or agent of Page 373 U. S. 389 an applicant upon filing proper power of attorney. [Footnote 10]"From the outset, a substantial number of those appearing in this capacity were engineers or chemists familiar with the technical subjects to which the patent application related.  "Many of them were not members of the bar.  It probably never occurred to anybody that they should be." [Footnote 11]  Moreover, although a concentration of patent practitioners developed in Washington, D.C., the regulations have provided since the reorganization of the Patent Office in 1836 that personal attendance in Washington is unnecessary, and that business with the Office should be transacted in writing. [Footnote 12]  The bulk of practitioners are now scattered throughout the country, and have been so distributed for many years. [Footnote 13]  As a practical matter, if Page 373 U. S. 390 practitioners were not so located, and thus could not easily consult with the inventors with whom they deal, their effectiveness would often be considerably impaired. [Footnote 14]  Respondent's suggestion that practice by nonlawyers was intended to be confined to the District of Columbia thus assumes either congressional ignorance or disregard of long established practice.Despite the early recognition of nonlawyers by the Patent Office, these agents, not subject to the professional restraints of their lawyer brethren, were particularly responsible for the deceptive advertising and victimization of inventors which long plagued the Patent Office. [Footnote 15]  To remedy these abuses, the Commissioner of Patents, in 1899, first required registration of persons practicing before the Patent Office, [Footnote 16] and, in 1918, required practitioners to obtain his prior approval of all advertising material which they distributed. [Footnote 17]  It was to reach these same evils that § 31 was given much its present form when, in 1922, the statute was amended to expressly authorize the Commissioner to prescribe regulations for the recognition of agents and attorneys. [Footnote 18] Page 373 U. S. 391This modification of the statute, first proposed in 1912, was designed to provide for the "creation of a patent bar" and "to require a higher standard of qualifications for registry." [Footnote 19]  Although it was brought to the attention of the House Committee on Patents that practitioners included lawyers and nonlawyers alike, [Footnote 20] it was never suggested that agents would be subject to exclusion.  In fact, although the Commissioner of Patents had at one time expressed the view that Patent Office abuses could be eliminated only by restricting practice to lawyers, [Footnote 21] Page 373 U. S. 392 his successor concluded that such a limitation would be unwise and during the pendency of this legislation recommended to Congress against such a limitation:"It has been suggested many times that the privilege of practising before the Office should be granted only after examination similar to examinations held for admission to the bar.  It is believed that this requirement would be too severe, as many persons not specially trained in the law and without any particular educational advantages may, by careful study of the practice and of the useful arts, learn adequately to prosecute applications.  Fundamentally, knowledge of the invention is more important than knowledge of the rules, and is often possessed by men of a type of mind which does not acquire legal knowledge readily. [Footnote 22]"Moreover, during the consideration in 1916 of another bill enacted to curb abusive advertising by patent practitioners, by prohibiting persons practicing before government agencies from using the names of government officials in their advertising literature, [Footnote 23] the same point was made on the floor of the House:"Mr. OGLESBY.  I will say to the gentleman that a good many men appear before the Patent Office who are not admitted attorneys.  The commissioner stated at the hearing that he had considered the question as to whether or not anyone except a regularly admitted attorney at law should be excluded from practicing before the Patent Office, but for certain reasons thought, perhaps, he ought not to establish such a rule. [Footnote 24] "Page 373 U. S. 393Disclosure that persons were falsely holding themselves out to be registered patent practitioners led in 1938 to the enactment of legislation making such misrepresentation a criminal offense. [Footnote 25]  This corrective legislation was under consideration for over a decade, and originally contained several other provisions, including one which would have prohibited any person"duly registered to practice in the Patent Office . . . [from holding] himself out as a patent attorney, patent lawyer, patent solicitor, or patent counselor unless he is legally admitted to practice law in the State . . . or in the District of Columbia. [Footnote 26]"During the extended consideration given the matter in both Houses of Congress, the distinction between patent lawyers, who had been admitted to the bar, and nonlawyer agents was repeatedly brought out; [Footnote 27] time and again, it was made clear that the above provision was not intended to restrict practice by agents, but was designed only to prevent them from labeling themselves "patent attorneys," [Footnote 28] as the Patent Office had theretofore permitted. [Footnote 29]  Page 373 U. S. 394 The proposed bills would not have affected "any engineers or draftsmen from doing those things which they have always been doing before the Patent Office"; [Footnote 30] the bills sought"to bring about no change in the status of the many men now registered and entitled to practice before the Patent Office, regardless of whether they are members of the bar or not. . . . [Footnote 31]"(Emphasis added.)"[T]here are quite a number of solicitors of patents who are highly qualified and who are not members of the bar, who never graduated at law, and were never admitted to the bar.  But this bill doesn't disqualify those men.  They can continue to qualify as patent agents. [Footnote 32]"(Emphasis added.)  When asked "[w]hat is going to be the difference in the legal prerogatives of the agents and the others that come in," the Commissioner of Patents responded that "[t]heir rights in the Patent Office will be exactly the same.  Their rights in the courts will be different." [Footnote 33]  Page 373 U. S. 395 (Emphasis added.)  The House debates on the bill before Congress in 1930 reveal the same understanding:"Mr. STAFFORD.  . . .  I was under the impression that hereafter a person in order to practice before the Patent Office must be admitted to practice before some bar of a State.""Mr. LaGUARDIA.  That is my understanding.""Mr. PERKINS.  I will correct myself.  He may be admitted to act as a patent agent, but, after the passage of this act, no one who is not admitted to the bar generally can hold himself out to be a patent attorney, patent lawyer, patent solicitor, or patent counselor.""Mr. STAFFORD.  A person, without being a member of the bar, may be registered as a patent agent to practice before the Commissioner of Patents?""Mr. PERKINS. He may. [Footnote 34]"Hence, during the period the 1922 statute was being considered, and prior to its readoption in 1952, [Footnote 35] we find strong and unchallenged implications that registered agents have a right to practice before the Patent Office.  The repeated efforts to assure Congress that no attempt was being made to limit this right are not without significance.  Nor is it insignificant that we find no suggestion that the abuses being perpetrated by patent agents could or should be corrected by the States.  To the contrary, reform was effected by the Patent Office, which now requires all practitioners to pass a rigorous examination Page 373 U. S. 396 37 CFR § 1.341(c), strictly regulates their advertising, 37 CFR § 1.345, and demands that"[a]ttorneys and agents appearing before the Patent Office . . . conform to the standards of ethical and professional conduct generally applicable to attorneys before the courts of the United States."37 CFR § 1.344.Moreover, the extent to which specialized lay practitioners should be allowed to practice before some 40-odd federal administrative agencies, including the Patent Office, received continuing attention both in and out of Congress during the period prior to 1952. [Footnote 36]  The Attorney General's Committee on Administrative Procedure, which, in 1941, studied the need for procedural reform in the administrative agencies, reported that"[e]specially among lawyers' organizations, there has been manifest a sentiment in recent years that only members of the bar should be admitted to practice before administrative agencies.  The Committee doubts that a sweeping interdiction of nonlawyer practitioners would be wise. . . . [Footnote 37]"Ultimately it was provided in § 6(a) of the Administrative Procedure Act that"[e]very party shall be accorded the Page 373 U. S. 397 right to appear in person or by or with counsel or other duly qualified representative in any agency proceeding. . . .  Nothing herein shall be construed either to grant or to deny to any person who is not a lawyer the right to appear for or represent others before any agency or in any agency proceeding."60 Stat. 240, 5 U.S.C. § 1005(a).  Although the act thus disavows any intention to change the existing practice before any of the agencies, so that the right of nonlawyers to practice before each agency must be determined by reference to the statute and regulations applicable to the particular agency, the history of § 6(a) contains further recognition of the power of agencies to admit nonlawyers, and again we see no suggestion that this power is in any way conditioned on the approval of the State.  The Chairman of the American Bar Association's committee on administrative law testified before the House Judiciary Committee:"A great deal of complaint has been received from two sources.  Number one is the lay practitioners before the various agencies, chiefly the Interstate Commerce Commission, who are afraid something might be said that would oust them from practice.  On the other hand, there is a great deal of protest from the committees on unauthorized practice of the law in various State, local, and municipal bar associations,  who are just as vehement in saying that these measures fail to recognize that legal procedure must be confined to lawyers. But these bills do not eliminate the lay practitioner, if the administrative agency feels they have a function to perform and desires to admit him to practice. [Footnote 38]"Despite the concern of the bar associations, the Senate Judiciary Committee reported that"nonlawyers, if permitted by the agency to practice before it, are not excluded from representing interested parties in administrative Page 373 U. S. 398 matters. [Footnote 39]"And, in the House debates on this provision, we find the following instructive passage:"Mr. AUSTIN.  Mr. President, before the Senator leaves that thought, I wish to ask a question.  I notice . . . in the section to which the Senator is referring, this language:""   Nothing herein shall be construed either to grant or to deny to any person who is not a lawyer the right to appear for or represent others before any agency or in any agency proceeding.""Is it not a fact that somewhere in the bill, the distinguished Senator has reserved the right to a non-professional -- that is, a man who is not a lawyer -- to appear if the agency having jurisdiction permits it?  That is, there is a discretion permitted, is there not?  For example, take a case where a scientific expert would better represent before the Commission the interests involved than would a lawyer.  The right to obtain that privilege is granted in the bill somewhere, is it not?""Mr. McCARRAN.  The Senator is correct; and, in connection with that, I wish to read from the Attorney General's comment, as follows:""   This subsection does not deal with, or in any way qualify, the present power of an agency to regulate practice at its bar.  It expressly provides, moreover, that nothing in the act shall be construed either to grant or to deny the right of nonlawyers to appear before agencies in a representative capacity.  Control over this matter remains in the respective agencies.""That is the Attorney General's observation. [Footnote 40]"(Emphasis added.) Page 373 U. S. 399It is also instructive to note that, shortly after the adoption of the Administrative Procedure Act, the American Bar Association proposed the adoption of an "Administrative Practitioners Act." [Footnote 41]Though limiting the powers of nonattorneys in respects not here relevant, the bill did provide that "authorized participation in agency proceedings" was permissible without regard to whether the conduct constituted the practice of law in the State where performed. [Footnote 42]Indicative of this same general understanding, we note that every state court considering the problem prior to 1952 agreed that the authority to participate in administrative proceedings conferred by the Patent Office and by Page 373 U. S. 400 other federal agencies was either consistent with or preemptive of state law. [Footnote 43]Finally, regard to the underlying considerations renders it difficult to conclude that Congress would have permitted Page 373 U. S. 401 a State to prohibit patent agents from operating within its boundaries had it expressly directed its attention to the problem.  The rights conferred by the issuance of letters patent are federal rights.  It is upon Congress that the Constitution has bestowed the power"To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries,"Art. I, § 8, cl. 8, and to take all steps necessary and proper to accomplish that end, Art. I, § 8, cl. 18, pursuant to which the Patent Office and its specialized bar have been established.  The Government, appearing as amicus curiae, informs the Court that, of the 7,544 persons registered to practice before the Patent Office in November 1962, 1,801 were not lawyers and 1,687 others were not lawyers admitted to the bar of the State in which they were practicing. [Footnote 44]  Hence, under the respondent's view, one-quarter of the present practitioners would be subject to disqualification or to relocation in the District of Columbia, and another one-fourth, unless reciprocity provisions for admission to the bar of the State in which they are practicing are available to them, might be forced to relocate, apply for admission to the State's bar, or discontinue practice.  The disruptive effect which Page 373 U. S. 402 this could have upon Patent Office proceedings cannot be ignored.  On the other hand, the State is primarily concerned with protecting its citizens from unskilled and unethical practitioners, [Footnote 45] interests which, as we have seen, the Patent Office now safeguards by testing applicants for registration, and by insisting on the maintenance of high standards of integrity.  Failure to comply with these standards may result in suspension or disbarment.  35 U.S.C. § 32; 37 CFR § 1.348.  So successful have the efforts of the Patent Office been that the Office was able to inform the Hoover Commission that"there is no significant difference between lawyers and nonlawyers, either with respect to their ability to handle the work or with respect to their ethical conduct. [Footnote 46]"Moreover, since patent practitioners are authorized to practice only before the Patent Office, the State maintains control over the practice of law within its borders except to the limited extent necessary for the accomplishment of the federal objectives. [Footnote 47] Page 373 U. S. 403We have not overlooked respondent's constitutional arguments, but find them singularly without merit.  We have already noted the source of Congress' power to grant patent rights.  It has never been doubted that the establishment of the Patent Office to process patent applications is appropriate, and plainly adapted to the end of securing to inventors the exclusive right to their discoveries, nor can it plausibly be suggested that, by taking steps to authorize competent persons to assist in the preparation of patent applications, Congress has exceeded the bounds of what is necessary and proper to the accomplishment of this same end.  Cf. Goldsmith v. United States Board of Tax Appeals, 270 U. S. 117; United States ex rel. Bernardin v. Duell, 172 U. S. 576.  Congress having acted within the scope of the powers "delegated to the United States by the Constitution," it has not exceeded the limits of the Tenth Amendment despite the concurrent effects of its legislation upon a matter otherwise within the control of the State."Interference with the power of the States was no constitutional criterion of the power of Congress.  If the power was not given, Congress could not exercise it; if given, they might exercise it, although it should interfere with the laws, or even the Constitution of the States."II Annals of Congress 1897 (remarks of Madison).  The Tenth Amendment "states but a truism that all is retained which has not been surrendered."  United States v. Darby, 312 U. S. 100,  312 U. S. 124; Case v. Bowles, 327 U. S. 92,  327 U. S. 102.  Compare Leslie Miller, Inc. v. Arkansas, 352 U. S. 187.  The authority of Congress is no less when the state power which it displaces would otherwise have been exercised by the state judiciary rather than by the state legislature.  Cf. Pennsylvania R. Co. v. Public Service Comm'n, 250 U. S. 566.  Finally, § 31 contains sufficient standards to guide the Patent Office in its admissions policy to avoid the criticism that Congress has improperly delegated its powers to the administrative Page 373 U. S. 404 agency.  Fahey v. Mallonee, 332 U. S. 245; Currin v. Wallace, 306 U. S. 1,  306 U. S. 16-18.It follows that the order enjoining petitioner must be vacated, since it prohibits him from performing tasks which are incident to the preparation and prosecution of patent applications before the Patent Office.  The judgment below is vacated, and the case is remanded for further proceedings not inconsistent with this opinion.It is so ordered
U.S. Supreme CourtSperry v. Florida, 373 U.S. 379 (1963)Sperry v. Florida ex rel. Florida BarNo. 322Argued March 25, 1963Decided May 27, 1963373 U.S. 379SyllabusPetitioner is not a lawyer, and has never been admitted to the Bar of any State, but, under regulations issued by the Commissioner of Patents with the approval of the Secretary of Commerce pursuant to 35 U.S.C. § 31, he has been authorized to practice before the United States Patent Office.  As part of that practice, he has for many years represented patent applicants, prepared and prosecuted their applications, and advised them in connection with their applications in the State of Florida.  The Florida Bar sued in the Supreme Court of Florida to enjoin the performance of these and other specified acts within the State, contending that they constituted unauthorized practice of law.Held:1. Florida may not prohibit petitioner from performing within the State tasks which are incident to the preparation and prosecution of patent applications before the Patent Office.  Pp.  373 U. S. 381-402.(a) The determination of the Supreme Court of Florida that the preparation and prosecution of patent applications for others constitutes the practice of law, within the meaning of the law of that State, is not questioned.  P.  373 U. S. 383.(b) Florida has a substantial interest in regulating the practice of law within the State, and, in the absence of federal legislation on the subject, it could validly prohibit nonlawyers from engaging in this circumscribed form of patent practice.  P.  373 U. S. 383.(c) A federal statute, 35 U.S.C. § 31, expressly permits the Commissioner of Patents to authorize practice before the Patent Office by nonlawyers; the Commissioner has explicitly granted such authority; and Florida may not deny to those failing to meet its own qualifications the right to perform acts within the scope of the federal authority.  Pp.  373 U. S. 384-385.(d) There cannot be read into the federal statute and regulations a condition that such practice must not be inconsistent with state law, thus leaving registered patent practitioners with the unqualified right to practice only in the physical presence of the Page 373 U. S. 380 Patent Office and in the District of Columbia, where that Office is now located.  Pp.  373 U. S. 385-387.(e) The legislative history of the statute and its predecessor provisions shows that Congress recognized that registration in the Patent Office confers a right to practice before that Office, without regard to whether the State within which the practice is conducted would otherwise prohibit such conduct.  Pp.  373 U. S. 387-402.(f) Since patent practitioners are authorized to practice only before the Patent Office, the State maintains control over the practice of law within its borders except to the limited extent necessary for the accomplishment of the federal objectives.  P.  373 U. S. 402.2. As so construed, 35 U.S.C. § 31 is constitutional.  Pp.  373 U. S. 403-404.(a) By establishing the Patent Office and authorizing competent persons to assist in the preparation of patent applications, Congress has not exceeded the bounds of what is "necessary and proper" to the operation of the patent system established under Art. I, § 8, Ch 8, of the Constitution.  P.  373 U. S. 403.(b) Having acted within the scope of the powers "delegated to the United States by the Constitution," Congress has not exceeded the limits of the Tenth Amendment, despite the concurrent effects of its legislation upon a matter otherwise within the control of the State.  P.  373 U. S. 403.(c) In view of the standards prescribed in 35 U.S.C. § 31 to guide the Patent Office in its admissions policy, it cannot be said that Congress has improperly delegated its powers to the administrative agency.  Pp.  373 U. S. 403-404.140 So. 2d 587, judgment vacated and cause remanded. Page 373 U. S. 381