Proximity switching system
Patent 4031408 Issued on June 21, 1977. Estimated Expiration Date: 
June 21, 1994. 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.
June 21, 1994. 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 3666988 3825797 Touch actuated electronic switch Motion detection system Patent #: 3956743 InventorApplicationNo. 05/619306 filed on 10/03/1975US Classes:307/116, Condition responsive307/652, Responsive to approach or passage of an object340/562CapacitanceExaminersPrimary: Scott, J. R.Assistant: Ginsburg, Morris Attorney, Agent or FirmAbstractThe system utilizes the conventional A. C. power line connected as a signal source and a shield about a sensor electrode mounted in a conventional wall box and coupled to a flip-flop circuit. When a body comes within operating range of the sensor, current flow is generated which operates the flip-flop and turns on an associated lamp. Associated circuitry may also be provided to turn the lamp off automatically and to perform other functions. | |
