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US Patent 4742246 - Preheat timer for use in oven
US Patent Issued on May 3, 1988
Estimated Patent Expiration Date:
February 3, 2007Estimated 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.
Estimated Patent Expiration Date:
February 3, 2007Estimated 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.AbstractA preheating timer for use in an oven unit ensuring uniform finish of cooked (or baked) food independent of high and low initial temperatures in the oven chamber, by applying a simplified electric circuit wherein it automatically determines the preheating time in response to the initial temperature in the oven chamber comprising; a capacitor simulating a temperature characteristics; the first resistor for charging the capacitor from the DC voltage circuit through a reverse-current inhibit diode; a voltage detection circuit composed of zener diode(s) and a transistor for detecting a voltage in the capacitor terminal; and the second resistor for discharging capacitor from the output terminal of the reverse-current inhibit diode. | InventorApplicationNo. 07/014080 filed on 02/03/1987US Classes:307/141.4, Electrically initiated307/140Power circuit controlledField of Search307/117, Light, heat, vibratory or radiant energy307/140, Power circuit controlled307/141With time delay or retardation meansExaminersPrimary: Pellinen, A. D.Assistant: Jennings, Derek S. Attorney, Agent or FirmUS Patent References3646560, 4110632, Device, method and system for controlling the supply of power to an electrical loadIssued on: 08/29/1978 Inventor: Wyland4370125, Control system for blue-flame oil burner Issued on: 01/25/1983 Inventor: Donnelly , et al.4389599, Light switch delay circuit Issued on: 06/21/1983 Inventor: Jabor4523103, Electronic time switch Issued on: 06/11/1985 Inventor: Zirkl4538074Power switch Issued on: 08/27/1985 Inventor: Fraden International ClassesF24C 7/08 (20060101)G05D 23/19 (20060101) Foreign Application Priority Data1983-02-25 JP |
