Gas-Tight Pharmaceutical Bottle Closure

Abstract

A gas-tight pharmaceutical container includes a pharmaceutical bottle defining a main enclosure and an upper neck forming a top opening. The upper neck includes an upper rim forming a planar engagement surface. A screw-on closure cap seals the top opening, and includes a circular top member and a circumferential flange. In one embodiment, the closure cap is metal and includes an annular pliable gasket secured to a peripheral portion thereof and a layer of lacquer applied interiorly of the gasket. In another embodiment, the closure cap is plastic and includes a circular inner liner formed by a base layer, a foil layer adjacent to the base layer, and an annular pliable gasket secured to the foil layer. With either embodiment, threaded engagement of the screw-on closure cap with the pharmaceutical bottle under pressure causes the pliable gasket to sealingly engage the upper rim to provide a gas-tight seal.

I claim: 
     
         1 . A gas-tight pharmaceutical container comprising:
 a pharmaceutical bottle including
 a main enclosure, 
 an upper neck extending from said main enclosure and forming a top opening for said main enclosure, said upper neck including external screw threads, and 
 an upper rim of said upper neck forming a planar engagement surface of said upper neck about said top opening of said upper neck; 
   a metal screw-on closure cap which is used to seal said top opening of said bottle and to repeatedly re-seal said top opening after a removal of said closure cap, said closure cap including
 a circular top member, and 
 a circumferential flange depending downwardly from said top member and defining an interior area of said top member, said flange having internal screw threads which mate with said external screws of said upper neck to secure said closure cap under pressure to said planar engagement surface of said upper neck of said main enclosure, and 
 an annular pliable gasket secured to a peripheral portion of said interior area of said top member; 
   whereby threaded engagement of said screw-on closure cap with said pharmaceutical bottle under pressure causes said pliable gasket to sealingly engage said upper rim of said pharmaceutical bottle to provide a gas-tight seal.   
     
     
         2 . A pharmaceutical container as claimed in  claim 1 , wherein said closure cap is aluminum. 
     
     
         3 . A pharmaceutical container as claimed in  claim 1 , wherein said closure cap is steel, and further including a layer of lacquer applied to said interior area of said top member inside of said gasket. 
     
     
         4 . A pharmaceutical container as claimed in  claim 1 , wherein a material of said pliable gasket is one of butyl, silicone, nitrile or fluoroelastomer. 
     
     
         5 . A pharmaceutical container as claimed in  claim 1 , wherein said pharmaceutical bottle is made of a plastics material. 
     
     
         6 . A pharmaceutical container as claimed in  claim 1 , further including a layer of lacquer applied to said interior area of said top member inside of said gasket. 
     
     
         7 . A pharmaceutical container as claimed in  claim 1 , wherein said gasket is adhered to said interior area of said top member. 
     
     
         8 . A pharmaceutical container as claimed in  claim 1 , wherein said gasket is resiliently held in place by said circumferential flange in a position immediately adjacent said interior area of said top member. 
     
     
         9 . A gas-tight pharmaceutical container comprising:
 a pharmaceutical bottle including
 a main enclosure, 
 an upper neck extending from said main enclosure and forming a top opening for said main enclosure, said upper neck including external screw threads, and 
 an upper rim of said upper neck forming a planar engagement surface of said upper neck about said top opening of said upper neck; 
   a screw-on closure cap which is used to seal said top opening of said bottle and to repeatedly re-seal said top opening after a removal of said closure cap, said closure cap including
 a circular top member, and 
 a circumferential flange depending downwardly from said top member and defining an interior area of said top member, said flange having internal screw threads which mate with said external screws of said upper neck to secure said closure cap under pressure to said planar engagement surface of said upper neck of said main enclosure; and 
   a circular inner liner which extends over said interior area of said top member of said closure cap, said inner liner including
 a base layer which is secured to said interior area of said top member at the top of said flange, 
 a foil layer adjacent to said base layer, and 
 an annular pliable gasket secured to a peripheral area of said foil layer; 
   whereby threaded engagement of said screw-on closure cap with said pharmaceutical bottle under pressure causes said pliable gasket to sealingly engage said upper rim of said pharmaceutical bottle to provide a gas-tight seal.   
     
     
         10 . A pharmaceutical container as claimed in  claim 6 , wherein said foil layer is adhered to said base layer. 
     
     
         11 . A pharmaceutical container as claimed in  claim 6 , wherein a material of said pliable gasket is one of butyl, silicone, nitrile or fluoroelastomer. 
     
     
         12 . A pharmaceutical container as claimed in  claim 6 , wherein said pharmaceutical bottle is made of a plastics material, and wherein said closure cape is made of a plastics material. 
     
     
         13 . A pharmaceutical container as claimed in  claim 9 , wherein said gasket is resiliently held in place by said circumferential flange in a position immediately adjacent said foil layer. 
     
     
         14 . A pharmaceutical container as claimed in  claim 9 , wherein said gasket is adhered in held in place to said foil layer. 
     
     
         15 . A pharmaceutical container as claimed in  claim 9 , wherein said base layer is made of wax cardboard. 
     
     
         16 . A pharmaceutical container as claimed in  claim 9 , wherein said base layer is made of a pulp material. 
     
     
         17 . A pharmaceutical container as claimed in  claim 9 , wherein said closure cap is child-resistant and further includes an outer cap about said top member and flange.