Accurate dosing pump and accessories therefor

Details Accurate dosing pump and accessories therefor Accurate dosing pump and accessories therefor

2007-08-28

2007-08-28

Kaufman, Joseph A. (Department: 3754)

Dispensing

With discharge assistant

Container with follower

C222S388000, C222S481500

Reexamination Certificate

active

10467904

ABSTRACT:
With the subject invention, a pump may be formed that generally includes a reservoir formed to accommodate at least one fluid dose, and a fluid-collecting chamber in communication with the reservoir. The fluid-collecting chamber is located such that fluid from the reservoir is fed thereinto, preferably gravitationally. A piston is disposed to reversibly slide within at least a dose-control portion of the fluid-collecting chamber, and the piston is configured such that upon sliding within the dose-control portion, the piston seals or substantially seals the dose-control portion from other portions of the fluid collecting chamber. The piston is configured to displace a volume of fluid from the sealed or substantially sealed dose-control portion which is approximately equal to or greater than the volume of one of the doses of the pump. A nozzle is also provided which is located such that the fluid displaced by the piston from the dose-control portion is generally urged towards the nozzle.

REFERENCES:
patent: 2781953 (1957-02-01), Sylvander
patent: 4995867 (1991-02-01), Zollinger
patent: 5190191 (1993-03-01), Reyman
patent: 5340289 (1994-08-01), Konieczynski et al.
patent: 5556268 (1996-09-01), Topper et al.
patent: 5816455 (1998-10-01), Alpers et al.
patent: 5957338 (1999-09-01), Lehmann
patent: 6010036 (2000-01-01), Bougamont et al.
patent: 6158621 (2000-12-01), Keller
patent: 6196424 (2001-03-01), Bougamont et al.
patent: 6467579 (2002-10-01), Simon

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