Self venting plunger

Details Self venting plunger Self venting plunger

1997-07-09

1999-03-09

Bomberg, Kenneth

Dispensing

With discharge assistant

Container with follower

222386, B67D 542

Patent

active

058789227

ABSTRACT:
A self-venting cartridge plunger including openings defined therein and forming through air passages, each opening having an associated valve flap hinge-joined to the plunger and movable to close the opening upon the plunger encountering a greater resistance to movement than the flow of evacuating air.

REFERENCES:
patent: 2755003 (1956-07-01), Sherbondy
patent: 4819836 (1989-04-01), Meckenstock
patent: 4951848 (1990-08-01), Keller
patent: 4966468 (1990-10-01), Bruning
patent: 5042695 (1991-08-01), Battegazzore
patent: 5150823 (1992-09-01), Sugita
patent: 5178305 (1993-01-01), Keller
patent: 5316186 (1994-05-01), Prestele
patent: 5377880 (1995-01-01), Moretti
patent: 5400926 (1995-03-01), Keller

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