Residual ink detection mechanism
Patent 4415886 Issued on November 15, 1983. Estimated Expiration Date: 
August 6, 2001. 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.
August 6, 2001. 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 ReferencesLiquid level monitoring apparatus Device for monitoring the ink supply in ink-operated printers Capacitive scheme for measuring the level of a liquid Patent #: 4295370 InventorsAssigneeApplicationNo. 06/290505 filed on 08/06/1981US Classes:340/618, Liquid101/366, Force discharge347/7, Fluid content (e.g., moisture or solvent content, ink refilling, liquid level)347/86, Cartridge73/304CCapacitativeExaminersPrimary: Brigance, Gerald L.Attorney, Agent or FirmInternational ClassesB41J 2/175 (20060101)G01F 23/22 (20060101) G01F 23/26 (20060101) Foreign Application Priority Data1980-08-12 JPAbstractA residual ink detection mechanism for detecting the amount of residual ink within an ink container of an ink jet printer is disclosed wherein the ink container comprises a flexible bag, and electrodes are provided at least at opposite positions of this bag to constitute a capacitor, so that the amount of residual ink within the ink container may be detected by detecting the electrostatic capacity between these paired electrodes. | |
