Method of operating a sand screw
January 24, 2012. 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 ReferencesApparatus and method for mixing a plurality of substances Automatic density control system for blending operation Controlling method and a measuring mixer for liquids and powders Process control system using remote computer and local site control computers for mixing a proppant with a fluid Process control system using remote computer and local site control computers for mixing a proppant with a fluid Automatic mixture control apparatus and method Vertical bottom-fill auger assembly Method and apparatus for controlling the flow of process fluids Patent #: 5089975 InventorAssigneeApplicationNo. 825229 filed on 01/24/1992US Classes:700/46, Rate control198/657, Screw222/55Constant weight, volume or pressure control by outputExaminersPrimary: Smith, JerryAssistant: Oakes, Brian C. Attorney, Agent or FirmInternational ClassG06F 015/46AbstractA method of operating a sand screw comprises: sensing speed of a sand screw delivering sand; determining a corrected delivery rate of sand, including converting the sensed speed of the sand screw into the corrected delivery rate of sand in response to predetermined sand screw delivery rate conversion data; and controlling the speed of the sand screw in response to the corrected delivery rate of sand. The sand screw delivery rate conversion data is based on first and second order polynomials defining the relationship between conventionally determined indicated sand screw delivery rates (i.e., using sand screw speed and a selected calibration factor) and actual delivery rates based on measured sand output.Other References
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