04509062 is referenced by 105 patents and cites 3 patents.

An ink reservoir which incorporates a negative back pressure source coupled to a membrane wall of the reservoir to prevent ink leakage from a reservoir orifice is disclosed. The back pressure is created by either a linear or nonlinear spring which can be either independent of, or integral with, the membrane. The result is freedom from ink leakage and improved quality printing when the reservoir is used in conjunction with an ink pen such as used in ink jet printing.

Title
Ink reservoir with essentially constant negative back pressure
Application Number
6/443973
Publication Number
4509062
Application Date
November 23, 1982
Publication Date
April 2, 1985
Inventor
Gary Siewell
Albany
OR, US
Frank L Cloutier
Corvallis
OR, US
Robert N Low
Corvallis
OR, US
Agent
Jeffery B Fromm
Assignee
Hewlett Packard Company
CA, US
IPC
G01D 15/16
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