Light switch delay circuit
Patent 4389599 Issued on June 21, 1983. Estimated Expiration Date: 
July 6, 2002. 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.
July 6, 2002. 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 3732484 Light switch with delayed turnoff Electronic controlled-duration switching Two terminal timed electric switch providing zero off-state current flow therethrough Patent #: 4336464 InventorApplicationNo. 06/395654 filed on 07/06/1982US Classes:315/360, TIME-CONTROLLED307/141, With time delay or retardation means315/199, Discharge control discharge device in the control circuit315/291CURRENT AND/OR VOLTAGE REGULATIONExaminersPrimary: LaRoche, Eugene R.Attorney, Agent or FirmInternational ClassH05B 37/02 (20060101)AbstractA delay circuit comprising two leads adapted to be connected across a light switch for delaying the turn off of a light bulb after the switch has been turned off. A silicon controlled rectifier (SCR) is connected across the two leads for applying power to the bulb when the SCR is on. An integrated circuit including an oscillator and a counter provides an output to the gate of the SCR for a predetermined time period following the opening of the switch for enabling the SCR to turn on. | |
