Pump having a port for drawing air or fluid

Details Pump having a port for drawing air or fluid Pump having a port for drawing air or fluid

2005-03-29

2005-03-29

Walberg, Teresa (Department: 3742)

Pumps

Expansible chamber type

Plural pumping chambers

C417S053000

Reexamination Certificate

active

06872060

ABSTRACT:
A pump includes a cylinder housing having a mouth for a fluid to flow out of the housing and a port for the fluid to flow into the housing, a piston slidably engaged in the housing. A tube is coupled to the piston for allowing the fluid to flow out through the tube when the piston moves away from the mouth. A check valve may block the tube when the piston moves toward the mouth. Another check valve may block the port when the piston moves toward the port. Another housing includes a mouth for coupling and supplying a pressurized fluid to the previous housing.

REFERENCES:
patent: 3790123 (1974-02-01), Grove et al.
patent: 4242057 (1980-12-01), Bender
patent: 4319603 (1982-03-01), Snyder
patent: 4971470 (1990-11-01), Moeck et al.
patent: 5489197 (1996-02-01), Tsai
patent: 5507624 (1996-04-01), Fehn
patent: 5531575 (1996-07-01), Lin
patent: 5638679 (1997-06-01), Richards
patent: 5885061 (1999-03-01), Olofsson et al.
patent: 6065947 (2000-05-01), Wu
patent: 6269981 (2001-08-01), Nielsen
patent: 6299420 (2001-10-01), Saputo et al.
patent: 6497560 (2002-12-01), Carlson

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