Liquid dispenser for dispensing foam

Details Liquid dispenser for dispensing foam Liquid dispenser for dispensing foam

2008-05-20

2008-05-20

Ngo, Lien M. (Department: 3754)

Dispensing

With casing or support

Bracket or suspension supported

C222S321800

Reissue Patent

active

11197729

ABSTRACT:
A pump assembly provides for direct replacement of volumes of liquid from a reservoir with equal volumes of air preferably at substantially atmospheric pressure, the same pressure or with pressure equalization to be at least equal to atmospheric pressure. A slide arrangement preferably positively displaces liquid from the reservoir and air into the reservoir. The pump draws air from the atmosphere into a chamber from which the air either is available for passage to replace liquid from the reservoir or is pressurized to assist dispensing liquid, preferably, admixing with the liquid to provide foaming. Gravity separation of air and liquid to be dispensed is used to replace liquid with air in the reservoir and to selectively place air and liquid into communication with passageways for ejection.

REFERENCES:
patent: 5165577 (1992-11-01), Ophardt
patent: 5271530 (1993-12-01), Uehira
patent: 5282552 (1994-02-01), Ophardt
patent: 5373970 (1994-12-01), Ophardt
patent: 5445288 (1995-08-01), Banks
patent: 5676277 (1997-10-01), Ophardt
patent: 5975360 (1999-11-01), Ophardt
patent: 6082586 (2000-07-01), Banks
patent: 6409050 (2002-06-01), Ophardt

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