Electronic toaster control
Patent 4170932 Issued on October 16, 1979. Estimated Expiration Date: 
June 21, 1997. 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, 1997. 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 ReferencesInventorApplicationNo. 05/808533 filed on 06/21/1977US Classes:99/326, Of heat and material219/388, With means whereby material to be heated may be passed continuously through heated area (e.g., conveyor)219/494, Thermally responsive219/497, Comprising voltage and/or current measuring and comparing or combining means219/501, Including semiconductor means (e.g., transistor)219/502, Utilizing light-sensitive and/or responsive means219/519, Including electromagnetic relay means392/416, With chamber99/329RT, Relative movement, toast and support99/331, Of heat or heater99/334Of materialExaminersPrimary: McCarthy, Edward J.International ClassesA47J 37/08 (20060101)H05B 1/02 (20060101) AbstractAn electronic control for controlling the degree of toasting of a bread slice in a toaster. The control includes a thermocouple located within the passage of the toaster for the bread slice and responsive to the temperature of the toaster casing, the slice of bread and the air temperature within the passage to produce a voltage proportional to the resultant temperature. This voltage is integrated and actuates an electronic pulse generator with an adjustable pulse width which produces a triggering pulse. This pulse is used to actuate a solenoid which unlatches the support for the bread slice. The operational amplifier has a predetermined output voltage of reference defining the threshold of operation of the pulse generator. The electronic control is very stable and, therefore, produces uniform toasting, since it integrates the time required to obtain the desired degree of toasting as a function of the temperature variation to which the bread slice is subjected. | |
