Draw back pump

Details Draw back pump Draw back pump

2007-09-11

2007-09-11

Jacyna, J. Casimer (Department: 3754)

Dispensing

With discharge assistant

With movable nozzle interconnected therewith

C222S321700, C222S181100, C417S550000

Reexamination Certificate

active

10938701

ABSTRACT:
A piston pump dispenser having a reciprocating piston pump arrangement which, in a dispensing stroke, dispenses fluid from an outlet and, in a charging stroke, to draw fluid from a reservoir also draws back fluid from the outlet through which fluid is dispensed in the dispensing stroke.

REFERENCES:
patent: 4781312 (1988-11-01), Strazdins
patent: 4949874 (1990-08-01), Fiedler
patent: 4991747 (1991-02-01), Von Brocklin et al.
patent: 5339990 (1994-08-01), Wilder
patent: 5458289 (1995-10-01), Cater et al.
patent: 5676277 (1997-10-01), Ophardt
patent: 5836482 (1998-11-01), Ophardt et al.
patent: 6557736 (2003-05-01), Ophardt
patent: 6601736 (2003-08-01), Ophardt et al.
patent: 199 01 027 (2000-07-01), None

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