Bottle caps
AssigneeMaxcap, Inc.
InventorRobert L. Nolan
Life of this patent
Estimating the term…
Abstract
A plastic cap for glass or plastic carbonated beverage bottles is shaped so that in use pressure is exerted around the edges of a gasket to give enhanced sealing. A single cap can fit the different necks of standard glass and plastic bottles. Its heat-shrinkable skirt has longer portions between connectors.
Claims8
A capped filled glass bottle of carbonated beverage under pressure said bottle having a standard glass bottle neck having an external thread whose pitch is 7 turns per inch, capped with a plastic screw cap screwed onto said neck,
- said cap comprising
- a top wall,
- an annular sidewall extending down from said top wall and having an inwardly extending thread for cooperation with said neck thread, said cap thread having a pitch of 8 turns per inch, said sidewall and said top wall meeting at a corner,
- a gasket held below said top wall and compressed against said top wall by engagement with the top of said bottle neck,
- the upper reach of said 8 t.p.i. cap thread being downwardly deformed by the upper reach of said 7 t.p.i. neck thread, said capped bottle retaining carbon dioxide therein at an internal pressure of 100 psig at a temperature of 68.degree. F.,
- said cap, prior to screwing onto said glass bottle neck, also fitting onto a standard plastic carbonated beverage bottle neck having an external thread whose pitch is 8 t.p.i. and being constructed to effectively seal such a filled plastic bottle at said pressure conditions,
- said bottle neck having an outwardly extending shoulder beneath said thread,
- said cap having an anti-tamper skirt in interfering relationship with said shoulder.
A plastic bottle cap for a bottle of carbonated beverage under pressure said bottle having a neck carrying an outwardly extending thread, said cap comprising:
- a top wall,
- an annular sidewall extending down from said top wall and having an inwardly extending thread for cooperation with said neck thread, said sidewall and said top wall meeting at a corner,
- a gasket held below said top wall in a position to be compressed against said top wall by engagement with the top of said bottle when the cap is screwed onto said neck,
- the improvement wherein
- said cap thread has a lower reach in which the thread pitch is about 7 turns per inch and an upper reach in which the thread pitch is about 8 turns per inch,
- the lengths of said reaches and the cap dimensions being such that said cap fits securely on both a standard threaded glass carbonated beverage bottle neck having a thread pitch of 7 t.p.i. and a standard plastic carbonated beverage bottle neck having about 11/2 thread turns with a thread pitch of 8 t.p.i.
Dependencies are inferred from the claim text.