Process control system using remote computer and local site control computers for mixing a proppant with a fluid
Patent 4916631 Issued on April 10, 1990. Estimated Expiration Date: 
April 10, 2007. 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.
April 10, 2007. 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 ReferencesInventorsAssigneeApplicationNo. 947099 filed on 12/24/1986US Classes:700/265, Nonreactive mixing process (e.g., mixing cement, preparing solution, diluting chemical)700/42Proportional-Integral-Derivative (P-I-D)ExaminersPrimary: Jablon, Clark A.Attorney, Agent or FirmForeign Patent References
International ClassesG06F 015/46G06G 007/58 G05D 011/02 G05D 011/08 AbstractA process control system for mixing a proppant with a fluid includes a remote control computer located remotely from where the process is to be performed, and a monitor computer and a local control computer both located where the process is to be performed. An LAN cable connects the remote control computer to the monitor and local control computers. The desired concentration value of the proppant in the fluid is entered into the remote control computer. The monitor computer sends measured values to the local control computer which generates a control signal to a sand screw to provide the desired concentration value.Other References
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