Electric motor-driven, double-acting pump having pressure-responsive actuation
Patent 4009971 Issued on March 1, 1977. Estimated Expiration Date: 
March 1, 1994. 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.
March 1, 1994. 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 ReferencesInventorsAssigneeApplicationNo. 500948 filed on 08/27/1974US Classes:417/43, Responsive to change in rate of pump fluid flow417/223, Disconnectable drive element (e.g., clutch, belt, shifter, etc.)417/415, Reciprocating rigid pumping member417/44.1, By control of electric or magnetic drive motor417/44.2Responsive to pump fluid pressureExaminersPrimary: Croyle, Carlton R.Assistant: Ross, Thomas I. Attorney, Agent or FirmAbstractA double acting pump is operated by a crank that is powered through a gear train driven by an electric motor. An adjustable pressure sensing device is used to control operation of the pump. A single motor, double pump embodiment is also described. | |
