Spring-bag printer ink cartridge with volume indicator
October 25, 2011. 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 ReferencesPressure indicators for inflatable cuff-type catheters Device for monitoring the ink supply in ink recording devices Device for monitoring the ink supply in ink-operated printers Fluid measuring system Residual ink detection mechanism Fluid tank and device for detecting remaining fluid Ink supplying mechanism Liquid jet apparatus with pressure sensor for indicating absence/presence of liquid Liquid level detector for ink jet printer Ink-jet recording apparatus and ink tank used therein InventorsApplicationNo. 717735 filed on 06/19/1991US Classes:347/86, Cartridge73/290R, LIQUID LEVEL OR DEPTH GAUGE116/227, Liquid level116/281, Rectilinear indicator with actuating means222/23WITH RECORDER, REGISTER, INDICATOR, SIGNAL OR EXHIBITORExaminersPrimary: Fuller, Benjamin R.Assistant: Barlow, John Foreign Patent References
International ClassB41J 002/17AbstractAn ink jet pen supply cartridge having a spring biased ink bag with a visual indication of remaining ink quantity. The spring-bag reservoir tends to collapse laterally as the ink supply decreases due to differential pressure exerted thereto. The spring-bag is contained in a rigid cartridge and a pair of flexible tape members are cemented or welded, one to each side of the spring-bag, and extend generally parallel toward a narrow end surface of the cartridge at which they overlap and can be viewed through a window. The overlapping relationship of the tape members provide ink quantity indicia which change as the spring-bag collapse draws them past each other. | |
