Glassware stopper with venting valve

Details Glassware stopper with venting valve Glassware stopper with venting valve

1981-09-24

1983-07-26

Norton, Donald F.

Bottles and jars

Closures

With means to facilitate closure removal

215314, B65D 3916

Patent

active

043949215

ABSTRACT:
A Teflon stopper for glassware includes a venting valve formed in the stopper with a valve stem threadably mounted within a bore in the stopper for selectively controlling communication between a vent passage within the stopper and a vent passage within the valve stem. An extractor assembly including a threaded portion on the outer end of the stopper and an extractor nut threadably mounted thereon is provided for easy extraction of the stopper from a flask opening.

REFERENCES:
patent: 20843 (1858-07-01), Ewing
patent: 607019 (1898-07-01), Comer
patent: 1075523 (1913-10-01), Vaterhaus
patent: 1085990 (1914-02-01), Morgan
patent: 2985180 (1961-05-01), Grayson
patent: 3059821 (1962-10-01), Kubiliunas
patent: 3476278 (1969-11-01), Lollmann

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