Inlet check valve for pump mechanism
Patent 5372487 Issued on December 13, 1994. Estimated Expiration Date: 
June 10, 2013. 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.
June 10, 2013. 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 3068494 3120712 3133696 Shoe with shock absorbing and stabiizing means Check valve Check valve Container for sealingly containing a fluid Self-sealing valve, a self-sealing, non-latex balloon, and a method for producing such a balloon High tech footwear Variable support shoe InventorAssigneeApplicationNo. 074372 filed on 06/10/1993US Classes:417/480, Valve in collapsible wall pumping member36/29, Pneumatic36/93, Form-fitting interior137/512.15, Integral resilient member forms plural valves137/846Having exit lipExaminersPrimary: Bertsch, Richard A.Assistant: Korytnyk, Peter Attorney, Agent or FirmInternational ClassesF04B 043/00A43B 007/14 AbstractAn intake valve for use in a thermoplastic fluid pump for inflatable bladders in which the valve is composed of superposed elastomeric layers and one of which is energy sealed at the center thereof to an inner wall portion of the pump about an inlet opening through said layer. The inlet opening is axially aligned with a hole through said pump wall so that ambient air may upon an expansion stroke of the pump enter the valve through said inlet opening and hole in the pump wall. Thereafter when the pump is compressed, air within the pump chamber will seal the inlet opening and force said air into the bladder through a check valve provided therefor. Thereafter when the pump is released, air will again be drawn into the pump chamber through the intake valve. | |
