Control system for blue-flame oil burner
Patent 4370125 Issued on January 25, 1983. Estimated Expiration Date: 
October 1, 2000. 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.
October 1, 2000. 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 3732433 3767354 Burner control with interrupted ignition Burner control system with primary safety switch Gas burner control system Oil burner primary control for interrupted ignition system Primary oil burner safety control and intermittent ignition system Patent #: 4278419 InventorsApplicationNo. 06/192850 filed on 10/01/1980US Classes:431/66, Sensor of electrical condition or temperature of electrical igniter controls fuel feed307/117, Light, heat, vibratory or radiant energy340/579, By ionization or conductivity431/71, Igniter cut off when flame establishment proved431/74, Combustion zone sensor controls igniter431/79Photoelectric sensorExaminersPrimary: Scott, SamuelAssistant: Focarino, Margaret A. Attorney, Agent or FirmInternational ClassF23N 5/12 (20060101)AbstractA control system for fluid fuel burners, particularly for blue-flame oil burners, utilizes flame conduction to control energizing of the light emitting portion of an optical coupler. Circuit means including the light responsive portion of the optical coupler is effective, in the presence of a predetermined level of illumination from the light emitting portion which occurs in the absence of a burner flame, to enable flow of a combustible fuel-air mixture and energizing of ignition means, and, in the subsequent absence of the predetermined level of illumination when burner flame exists, to terminate energizing of the ignition means and to enable continued flow of the combustible mixture. The control system further includes means for reducing the rate and level of illumination of the light emitting portion so that it requires a predetermined time period for the light emitting portion to be energized to the predetermined level of illumination. This predetermined time period prevents initial energizing of the system in the event of a false flame indication, and enables uninterrupted system operation in the event of a momentary loss of flame conduction.Field of SearchSensor of electrical condition or temperature of electrical igniter controls fuel feedShutdown by sensed absence of flame in proving period Igniter cut off when flame establishment proved Combustion zone sensor controls igniter By combustion or combustion zone sensor Of shutdown by response to sensed combustion failure or overheat By electrical control circuit | |
