Vacuum release mechanism

Details Vacuum release mechanism Vacuum release mechanism

2008-05-05

2011-11-15

Nicolas, Frederick C. (Department: 3754)

Dispensing

With discharge assistant

With movable nozzle interconnected therewith

C222S001000, C222S152000, C222S321900, C222S340000, C222S385000, C222S481500, C417S550000

Reexamination Certificate

active

08056772

ABSTRACT:
A piston pump in which the piston carries a valve and a control mechanism to change a characteristic of the valve, preferably, its tendency to open. The valve may preferably comprise a disc which extends radially outwardly from the piston to resiliently engage the wall of piston chamber. The control mechanism preferably provides an access port communicating axially through the piston and axially out an opening of the piston chamber. In a preferred embodiment, the control mechanism comprises a bladder with a flexible side wall which can be moved from an inherent uncollapsed position to a different position and which bladder is inherently biased to return to its uncollapsed position.

REFERENCES:
patent: 5011046 (1991-04-01), Graf et al.
patent: 5282552 (1994-02-01), Ophardt
patent: 5373970 (1994-12-01), Ophardt
patent: 5676277 (1997-10-01), Ophardt
patent: 5979711 (1999-11-01), Fuchs et al.
patent: 6557736 (2003-05-01), Ophardt
patent: 7267251 (2007-09-01), Ophardt
patent: 7389893 (2008-06-01), Kasting
patent: 0 289 854 (1988-11-01), None
patent: 0 289 855 (1988-11-01), None

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