referring to the drawings , exemplary embodiments of the invention will be described in detail . fig1 shows cartridge 10 , in accordance with the invention , which is formed of a cylindrical body 12 that defines a passageway 14 through which a stream of fluid such as air can travel . a reservoir 16 is mounted within the passageway 14 for holding nicotine free base for the reasons discussed below . the reservoir 16 can be formed of a porous polymer plug or other suitable materials such as described in u . s . pat . nos . 4 , 284 , 089 ; 4 , 800 , 903 ; and 4 , 813 , 437 , the contents of such patents being incorporated by reference as though fully set forth herein . these three patents are now owned by the entity which owns the invention described in this patent application . for the purposes of the invention as described , the reservoir is formed of porous polyethylene in which a thin layer of liquid nicotine has been distributed . details of the porous plug and its operation and the composition of nicotine are described in greater detail in u . s . pat . no . 4 , 800 , 903 . for the purposes of this invention , the polyethylene plug can be charged with a mixture of nicotine , menthol , and ethanol . the weight ratio of nicotine to menthol to ethanol is preferably about 10 : 1 : 120 . a weight ratio of 10 : 1 : 160 has additionally been tested and proved to function well . as an example , the composition of the loading solution for approximately 150 , 000 polyethylene plugs is made up of 18 , 000 grams of ethanol , 1 , 500 grams of nicotine , and 150 menthol . a given amount of ethanol is placed in a mixing vessel ( not shown ) and the menthol is added and stirred until it is completely dissolved . nicotine is then added through the solution and agitated manually for about three minutes . a tight fitting lid is then placed on the mixing vessel . the temperature of cooling water in a condenser ( not shown ) is then adjusted to 14 ° c . and circulated at a volume of 10 liters / minute . a jacketed vacuum drier ( not shown ), with an inner volume of 260 liters , has water circulated through the jacket at a temperature of 20 °± 1 ° c . at a volume of 5 liters / minute . the plugs are placed into the vacuum drier and the vessel is evacuated to less than - 27 inches of mercury . the nicotine / ethanol solution is sucked by the aid of the under pressure into the vacuum drier . the vacuum valve is then shut . the vacuum should be less than 20 inches of mercury . the vacuum drier is then rotated at a speed of 4 revolutions per minute for 10 minutes . the vacuum pump is then started and vacuum valve opened and the temperature on the inlet water to the vacuum drier is raised to 40 °± 1 ° c . the vacuum drier and pump should operate until a temperature differential of 5 °- 6 ° is reached between the inner temperature of the vacuum drier and the inlet water to the same drier . a kinney high vacuum pump model kc - 8 was utilized in the above - described procedure . when the temperature differential mentioned above is reached , the vacuum drier and pumps are stopped . the vacuum drier is then filled with nitrogen and the polyethylene plugs are unloaded into a specially designed container which is evacuated to a pressure of minus 28 inches of mercury and then refilled with nitrogen . this procedure is then repeated to make sure all of the oxygen has been removed from the system . the nitrogen - loaded polyethylene plugs are then kept in a bulk container filled with nitrogen to protect the nicotine against oxygen . the plugs are then inserted into suitable tubes in a nitrogen atmosphere and sealed as discussed below . in order to prevent oxygen from migrating into the cartridge 10 after it is fabricated and to prevent the nicotine from migrating out of the cartridge 10 , the cylindrical body 12 is formed of a nicotine - impermeable material . a suitable material found for this purpose is a copolymer of acrylonitrile and methacrylate sold under the trade name barex ® by b . p .- sohio . a variety of compounds had been tested for use as nicotine - impermeable materials . initially , it was believed that crystalline polymers , due to the small nature of their interstitial spaces , would make good candidates . however these compounds were found to be ineffective in deterring nicotine migration . unexpectedly , barex proved to be an effective material even though it is an amorphous polymer . barex is particularly suited to the application described since it is heat sealable to provide a nicotine - impermeable barrier at the seal and is composed of ingredients which are permissible for use as an adhesive under the provisions of f . d . a . regulation 21 cfr 175 . 105 . barex can also be adhered to aluminum or other metal foils so that a suitable nicotine - impermeable package can easily be formed by heat sealing adjacent layers of barex film with the aluminum foil as a backing for one or more layers . for the embodiment of fig1 in order to maintain the inert gas in the tube after the reservoir 16 has been inserted , both ends of the tube are covered with a nicotine - impermeable barrier such as a layer of aluminum foil 18 . the foil layers are sealed to the barex tube 12 through a layer of barex 20 adhered to the foil 18 so that the layers of foil 18 can easily be sealed to the ends of the barex tube 12 through the application of heat . while the barex is adhered to the aluminum foil by the use of a suitable adhesive , such adhesives cannot be used to seal the layers of barex together or the aluminum foil to the barex since such adhesives are not themselves nicotine - impermeable and the nicotine will migrate through the seal itself . a cartridge 10 of the type described above can be used in conjunction with a mouthpiece 22 as shown in fig2 . by forming the cylindrical body 12 of barex and using pieces of barex - coated aluminum foil to form the passageway barrier portions , the nicotine free base charged into the reservoir 16 is prevented from migrating out of the cartridge 10 by inserting and maintaining the nicotine - containing reservoir 16 in an oxygen - free environment . for example , by charging the cartridge 10 with an inert gas such as nitrogen , degradation through interaction with oxygen of the nicotine free base is prevented . in this way , a fully effective dose of nicotine is available for the user upon penetration of the pieces of foil 18 as described below . alternatively to the construction described above , the nicotine - impermeable barrier can be formed in other ways . for example , the tube could be formed of pe or other types of rigid materials with a layer of barex adhered to the inner surface of the tube . instead of having a tube , a reservoir could be formed with openings in either end with the reservoir coated entirely with a layer of barex with the ends being penetrable as discussed . other suitable cartridges could also be formed in accordance with the invention as long as the nicotine is isolated from the atmosphere by means of a nicotine - impermeable barrier and the barrier is penetrable to release the nicotine when desired . as shown in fig2 a mouthpiece 22 can be used which includes a mouth engaging portion 24 and a cartridge holder 26 . a passageway 28 is formed to extend from the mouth engaging portion 24 through to cartridge holder 26 . as shown in fig3 a and 3b , in order to mount the cartridge 10 in the mouthpiece 22 , the cartridge 10 is placed in the outer end of the cartridge holder 26 , adjacent to a sharpened tip 30 which is formed around the portion of the passageway 28 that communicates with the cartridge holder 26 . the sharpened tip 30 is in the form of a cylindrical section cut at an angle so that a cylindrical space 32 is formed between the outer surface of the sharpened tip and the inner surface of the cartridge holder 26 to receive a portion of the cylindrical body 12 as the cartridge 10 is pushed into place to the position shown in fig3 b in the direction of arrow 34 . the inner surface of the cartridge holder 26 and the cartridge 10 are designed so that when the cartridge 10 is in the position shown in fig3 b , the cartridge 10 is held in place by the cylindrical wall which forms the cartridge holder 26 . by pushing the cartridge in the direction of the arrow 34 , the pointed tip 30 operates to penetrate the aluminum foil layer 18 on the inner end of the cartridge 10 and expose it to the passageway 28 of the mouthpiece 22 . in order to allow air to flow through the cartridge 10 and pass by or through the reservoir 16 , the nicotine - impermeable layer 18 on outer end of the cartridge 10 must also be penetrated . this can be done by any sharp object such as a knife or the like . however , one way of providing an easily - usable sharpened object is to provide dispensers 36a - b of the type shown in fig4 a - b which are formed of molded plastic and contain a number of compartments 38a - b for receiving cartridges 10 ( not shown ). in fig4 a , a tray 40 is also provided for holding a mouthpiece 22 . all of these components can be shrink wrapped in a transparent plastic and used as a sales package . in order to provide a handy sharpened object for penetrating the foil layer 18 over the outer end of the cartridge 10 , a sharpened tip 42a - b can be provided . in this way , after a cartridge 10 is inserted into the end of the mouthpiece 22 and pushed to the position shown in fig3 b , the outer end can be penetrated simply by pushing it against the sharpened tip 42a - b as shown , for example in fig4 a . in this way , the passageway 28 communicates with the atmosphere through the passageway 14 of the cartridge 10 so that the user can suck on the mouth engaging end 24 of the mouthpiece 22 in order to receive nicotine vapor as described . an alternative to using a sharpened tip to penetrate either or both foil ends is to form the foil with a portion that can be grasped ( not shown ) and then having the user peel the foil layer 18 off the cartridge 10 . another embodiment of the invention is shown in fig5 and 6 where a cartridge 10 of the same configuration described above is used in conjunction with a cartridge penetrator / cover 44 . as shown in fig5 a , the penetrator / cover 44 is inserted over the outer end of the cartridge 10 and the combination is then inserted into the outer end of the cartridge holder 26 of the mouthpiece 22 similar to the one shown in fig2 and 3 . the cartridge penetrator / cover is formed of a cylinder 46 which defines a passageway 48 , the outer end of which is defined by a cylindrical sharpened tip 50 which is similar in design to the sharpened tip 30 in the cartridge holder 26 . an annular space 52 is formed between the outer surface of the sharpened tip 50 and the inner surface of the cylinder 46 for receiving the cylindrical body 12 of the cartridge 10 . after the penetrator / cover 44 is placed over the outer end of the cartridge 10 , it is pushed toward the position shown in fig5 in the direction of arrow 54 ( fig5 b ) so that the sharpened tip 50 operates to penetrate the foil layer 18 located over the outer end of the cartridge 10 . in this way , the passageways 28 of the mouthpiece 22 and 14 of the cartridge 10 communicate with each other and with the atmosphere so that the user is able to suck on the mouthpiece and receive the nicotine vapor as described above . the embodiment of the invention shown in fig5 and 6 can be packaged in a manner shown in fig7 where a molded plastic tray 56 includes a number of compartments 58 designed to hold a cartridge and cartridge penetrator / cover 44 in the non - penetrating position shown in fig5 a . a compartment 60 can also be provided to hold a mouthpiece 22 with all of the elements being packaged by shrink wrapping them in transparent plastic ( not shown ). by providing the inhaler described above , a cartridge for holding nicotine to be used in conjunction with the mouthpiece can be marketed without losing its effectiveness through an unnecessarily short shelf - life . by providing a cartridge with a nicotine - impermeable barrier , nicotine is prevented from migrating out of the cartridge and the dosage initially provided is maintained throughout the life of the product . further , by maintaining and storing the nicotine reservoir in an oxygen - free atmosphere , the nicotine is prevented from degrading through the interaction with the oxygen and the effective level of the nicotine dose is maintained . the foregoing description is not intended to be limiting in nature and the invention is intended to include all improvements and variations beyond those specifically described , which fall within the spirit and scope of the appended claims .
the present invention relates to a nicotine - impermeable container including a barrier layer of acrylonitrile and methyl acrylate and a method for fabricating same . additionally , the invention relates to a nicotine inhaling device which allows a user to ingest nicotine vapors orally . the nicotine inhaling device of the present invention is primarily directed to a device which can be used as a smoking cessation aid .