Concrete pump and method of using same
Patent 4347033 Issued on August 31, 1982. Estimated Expiration Date: 
February 19, 2000. 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.
February 19, 2000. 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 827296 1061142 2144417 2245035 2448849 3045428 3312176 3692422 3786996 Disc pump or turbine Patent #: 4025225 InventorApplicationNo. 06/117642 filed on 02/19/1980US Classes:415/90, SMOOTH RUNNER SURFACE FOR WORKING FLUID FRICTIONAL CONTACT (E.G., UNBLADED RUNNER, ETC.)415/1, METHOD OF OPERATION415/121.1, WITH CUTTER OR COMMINUTOR FOR DEBRIS IN WORKING FLUID415/182.1, WORKING FLUID PASSAGE OR DISTRIBUTING MEANS ASSOCIATED WITH RUNNER (E.G., CASING, ETC.)415/201, Access opening through portion of casing or cover417/900SLURRY PUMPS (E.G., CONCRETE)ExaminersPrimary: Smith, Leonard E.Attorney, Agent or FirmInternational ClassesF04D 17/00 (20060101)F04D 17/16 (20060101) F04D 5/00 (20060101) AbstractA method of transferring flowable concrete containing aggregate to a desired location at substantially constant rate without sharp variations in pressure and a power driven pump that may be used to carry out the method. The pump requires no valves, is highly abrasive resistant, has a high constant flow rate discharge due to not operating intermittently, and subjects the conduit or hose through which the concrete discharges to a minimum of strain as the concrete flows at a substantially constant rate therethrough with no sharp variations in pressure, and with minimum frictional resistance.Other References
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