law: Patents Act, 1970
  28. Mention of inventor as such in patent 
  (1) If t he controller is satisfied, upon a request or claim
  
  made in accordance with the provisions of this section- 
  (a) that the person in respect of or by whom
  
  the request or claim is made is the inventor of an invention in respect of
  
  which application for a patent has been made, or of a substantial part of that
  
  invention; and
  (b) that the application for the patent is a
  
  direct consequence of his being the inventor, the Controller shall, subject to
  
  the provisions of this section, cause him to be mentioned as inventor in any
  
  patent granted in pursuance of the application in the complete specification
  
  and in the register of patents:
  PROVIDED  that the mention of any person as inventor
  
  under this section shall not confer or derogate from any rights under the
  
  patent.
  (2) A request that any person shall be mentioned as aforesaid
  
  may be made in the prescribed manner by the applicant for the patent or (where
  
  the person alleged to be the inventor is not the applicant or one of the applicants)
  
  by the applicant and that person.
  (3) If any person [other than a person in respect of whom a
  
  request in relation to the application in question has been made under
  
  sub-section (2),] desires to be mentioned as aforesaid, he may make a claim in
  
  the prescribed manner in that behalf.
  (4) A request or claim under the foregoing provisions of this
  
  section shall be made not later than two months after the date of advertisement
  
  of acceptance of the complete specification or within such further period (not
  
  exceeding one month) as the Controller may, on an application made to him in
  
  that behalf before the expiration of the said period of two months and subject
  
  to the payment of the prescribed fee, allow.
  (5) No request or claim under the foregoing provisions of this
  
  section shall be entertained if it appears to the Controller that the request
  
  or claim is based upon facts which, if proved in the case of an opposition
  
  under the provisions of clause (a) of sub-section (1) of section 25 by the
  
  person in respect of or by whom the request or claim is made, would have
  
  entitled him to relief under that section.
  (6) Subject to the provisions of sub-section (5), where a claim
  
  is made under sub-section (3), the Controller shall give notice of the claim to
  
  every applicant for the patent (not being the claimant) and to any other person
  
  whom the Controller may consider to be interested; and before deciding upon any
  
  request or claim made under sub-section (2) or sub-section (3), the Controller
  
  shall, if required, hear the person in respect of or by whom the request or
  
  claim is made, and, in the case of a claim under sub-section (3), any person to
  
  whom notice of the claim has been given as aforesaid.
  (7) Where any person has been mentioned as inventor in pursuance
  
  of this section, any other person who alleges that he ought not to have been so
  
  mentioned may at any time apply to the Controller for a certificate to that
  
  effect, and the Controller may, after hearing, if required, any person whom he
  
  may consider to be interested, issue such a certificate, and if he does so, he
  
  shall rectify the specification and the register accordingly.