Pumping system and method of operating the same
Patent 4611973 Issued on September 16, 1986. Estimated Expiration Date: 
September 16, 2003. 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 16, 2003. 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 ReferencesInventorAssigneeApplicationNo. 06/529487 filed on 09/06/1983US Classes:417/342, Including closed fluid interconnection between working members417/347, Single member controls motive fluid for each working member417/401, Integral pump and motor pistons417/554Ball typeExaminersPrimary: Smith, Leonard E.Attorney, Agent or FirmInternational ClassesF04B 15/00 (20060101)F04B 15/02 (20060101) F04B 53/12 (20060101) F04B 53/16 (20060101) F04B 53/10 (20060101) F04B 53/00 (20060101) AbstractImproved mud pump comprised of plural cylinder pumping units, each cylinder unit consisting of a pumping compression chamber and two or more hydraulic driven expansion chambers, with one or more expansion chambers being employed to drive a pumping plunger to cause fluid to be pumped through the compression chamber, also one or more of said expansion chambers being employed to return the plunger; the plunger further being employed as the housing for one or more of the said expansion chambers. The invention includes novel hydraulic drive circuitry and novel hydraulic distribution valving means for control of the hydraulic drive fluid that is utilized to drive the expansion chamber of each cylinder pumping unit. The invention also includes novel positioning means for the unidirectional inlet and outlet mud pumping valves.Field of SearchWITH CONDITION RESPONSIVE CONTROL OF COOLANT OR LUBRICANTIncluding closed fluid interconnection between working members Single member controls motive fluid for each working member Common pumping and motor working member Integral pump and motor pistons Double acting motor piston Including valve assembly, disassembly, or inspection facilitating means Biasing means effects eduction stroke of abutment driven, pressure producing pumping member Nonrotary pumping and fluid motor working members Independently operated valve for each working member | |
