Differential pressure valve unit

Details Differential pressure valve unit Differential pressure valve unit

2006-10-27

2010-02-23

Meier, Stephen D (Department: 2853)

Incremental printing of symbolic information

Ink jet

Fluid or fluid source handling means

C347S085000, C251S061200

Reexamination Certificate

active

07665833

ABSTRACT:
A differential pressure valve unit that is accommodated in a liquid cartridge main body having: a liquid containing portion containing liquid; and a liquid supply portion supplying the liquid in the liquid containing portion to the outside, the differential pressure value unit including: a membrane valve that is opened when a predetermined pressure difference between the liquid containing portion and the liquid supply portion occurs; and a first member that holds the membrane valve and forms a downstream pressure chamber together with the membrane valve, wherein, in the first member, an opposing surface forming the downstream pressure chamber and having a connection port connected to the liquid supply portion has a shape corresponding to a movable range of the membrane valve, and a groove portion is provided at the opposing surface in order to allow the liquid in the downstream pressure chamber to easily flow into the connection port.

REFERENCES:
patent: 6550901 (2003-04-01), Iida
patent: 6585358 (2003-07-01), Usui et al.
patent: 7090341 (2006-08-01), Miyazawa
patent: 7097293 (2006-08-01), Ichihashi et al.
patent: 2001/0006396 (2001-07-01), Iida
patent: 1 016 533 (2000-07-01), None
patent: 1 428 664 (2004-06-01), None
patent: 2004-237720 (2004-08-01), None
Extended European Search Report for European patent appln. No. 06126010.5 (Apr. 19, 2007).

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