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| Number | Title | Issue Date |
| 4197577 | Control system A control system of the non-linear type which behaves in a substantially `proportional` manner. The system comprises an error detector which compares the input and output of a plant to obtain an error value, and a control unit which derives from the error... | 04/08/1980 |
| 4151588 | Method and apparatus for controlling one or several variables depending on several control inputs In order to control a variable of a control system depending on a plurality of control inputs to minimize an error function, one control input at a time is, at regular intervals, varied step by step in the same direction until the sign of the differential... | 04/24/1979 |
| 3983376 | Control device for a machine tool An apparatus for controlling a machine tool which includes a measuring head for measuring a dimension (i.e. a diameter) of a workpiece, a detector for detecting and holding the maximum dimension measured by the measuring head, a circuit for determining th... | 09/28/1976 |
| 3969078 | HF Alkylation reaction temperature control system A control system for regulating the reaction zone temperature in a process for the acid-catalyzed reaction of an isoparaffin with an olefinic feed stream containing mixed olefins. Hydrocarbon analyzers produce process output signals which are representati... | 07/13/1976 |
| 3960320 | Combustion optimizer There has been provided an improved process control optimizer for regulating at least one parameter of the process relative to optimum utilization of available energy. Temperature responsive open loop control means regulates the fuel flow and the optimize... | 06/01/1976 |
| 3948603 | Control system for HF alkylation A control system for regulating the reaction zone temperature in a process for the acid-catalyzed alkylation of an isoparaffin with an olefinic feed stream containing mixed olefins. The reaction zone temperature is adjusted to obtain the optimum for a giv... | 04/06/1976 |
| 3937749 | HF Alkylation reaction temperature control A control system and method for regulating the reaction zone temperature in a process for the acid-catalyzed alkylation of an isoparaffin with an olefinic feed stream containing mixed olefins. The reaction zone temperature is adjusted to obtain the optimu... | 02/10/1976 |
