Fluid product dispensing pump

Details Fluid product dispensing pump Fluid product dispensing pump

2007-02-06

2007-02-06

Kaufman, Joseph A (Department: 3754)

Dispensing

With filter

Associated with vent passage

C222S190000, C222S321600, C222S321900

Reexamination Certificate

active

10494483

ABSTRACT:
A fluid-dispenser pump having a pump body (10) containing a measuring chamber (20) defined between an upper piston (30) sliding in an upper portion (11) of the pump body (10), and a lower piston (40) sliding in a lower portion (12) of the pump body (10). The lower piston (40) co-operates with a spring (50) disposed in the lower portion (12) of the pump body (10). The spring (50) is isolated from any contact with the fluid, and the lower portion (12) of the pump body includes an air-intake (15) enabling air to be admitted and/or expelled during actuation of the pump. Isolation is provided to prevent fluid from penetrating into the air-intake (15).

REFERENCES:
patent: 2802490 (1957-08-01), Ward
patent: 5147073 (1992-09-01), Cater
patent: 5217148 (1993-06-01), Cater
patent: 5813571 (1998-09-01), Gaucher
patent: 6119899 (2000-09-01), Iizuka et al.
patent: 6237814 (2001-05-01), Blyler et al.
patent: 6244472 (2001-06-01), Hennemann
patent: 6460738 (2002-10-01), Petit
patent: 1 524 293 (1978-09-01), None
patent: 2 361 229 (2001-10-01), None

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