Ink reservoir with essentially constant negative back pressure
Patent 4509062 Issued on April 2, 1985. Estimated Expiration Date: 
November 23, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 23, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2704551 Ink jet printer Fluid tank and device for detecting remaining fluid Patent #: 4422084 InventorsApplicationNo. 06/443973 filed on 11/23/1982US Classes:347/87, With integral ejector347/56With thermal force ejectionExaminersPrimary: Goldberg, E. A.Assistant: Reinhart, Mark J. Attorney, Agent or FirmInternational ClassB41J 2/175 (20060101)AbstractAn 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.Other References
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