Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2006-08-08
2006-08-08
Hofsass, Jeffery (Department: 2636)
Communications: electrical
Condition responsive indicating system
Specific condition
C250S372000, C431S079000, C313S539000
Reexamination Certificate
active
07088253
ABSTRACT:
A flame detector and burner fuel valve control has an ultraviolet sensitive, cold cathode, gas discharge tube in a DC quench circuit. In the presence of a flame, the circuit generates a pulse signal at a frequency related to the intensity of radiation from the flame. The pulse signal from a contaminated tube is at a higher frequency. A frequency discriminator circuit distinguishes between a flame responsive signal and a contaminated tube signal and controls the burner fuel valve.
REFERENCES:
patent: 2944152 (1960-07-01), Johnson et al.
patent: 3336479 (1967-08-01), Blackett
patent: 3493753 (1970-02-01), Stowe
patent: 3541549 (1970-11-01), Graves
patent: 3574496 (1971-04-01), Hewitt
patent: 3755799 (1973-08-01), Riccardi
patent: 3854056 (1974-12-01), Cade
patent: 3936648 (1976-02-01), Cormault et al.
patent: 4000961 (1977-01-01), Mandock
patent: 4328527 (1982-05-01), Landis
patent: 4823114 (1989-04-01), Gotisar
patent: 4835525 (1989-05-01), Egi et al.
patent: 5189398 (1993-02-01), Mizutani
patent: 5256057 (1993-10-01), Grow
patent: 2532448 (1977-01-01), None
Hamamatsu UVtron® (Ultraviolet Detector Tube) Technical Information—Jul. 1984.
Maier Electronics, Inc. U.V. Detector Tube PX-1 Specifications—Undated.
Maier Electronics Inc. U.V. Detector Tube PX-1—Undated.
Hofsass Jeffery
Lai Anne V.
Protection Controls Inc.
Wood Phillips Katz Clark & Mortimer
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