Double acting engine and pump
Patent 4477234 Issued on October 16, 1984. Estimated Expiration Date: 
September 13, 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.
September 13, 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 2046834 2799225 2948224 3849030 InventorApplicationNo. 06/416996 filed on 09/13/1982US Classes:417/393, With additional unitary common pumping and motor working member417/563, Similar inlet and discharge distributors of different size or material417/571Inlet and discharge distributorsExaminersPrimary: Smith, Leonard E.Attorney, Agent or FirmInternational ClassesF04B 47/08 (20060101)F04B 47/00 (20060101) AbstractA double acting hydraulically actuated pump and engine valve assembly for use downhole in a borehole for producing fossil fuel therefrom. High pressure hydraulic power fluid is forced downhole to a special control valve means located between opposed engine pistons. The valve means causes the power fluid to apply an alternating force to confronting faces of the pistons, while the opposed faces of the spaced apart pistons serve to pump and force production fluid to flow from a production zone, upward to the surface. The pump assembly can be used in combination with existing bottom hole assemblies, fixed or free type, already installed downhole in the wellbore. | |
