The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 14, 1993
Filed:
Aug. 29, 1991
Applicant:
Inventor:
Roland V Cabalfin, Anaheim, CA (US);
Assignee:
Hydrotech Chemical Corporation, City of Industry, CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
250554 ; 2503381 ;
Abstract
An infrared flame sensor apparatus useful for detecting a flame in the combustion chamber of a water heater or boiler is disclosed. An infrared phototransistor with narrow light frequency response detects the infrared components emitted by the flame. A flame signal proportional to the amount of infrared radiation detected is generated. The flame signal is filtered to remove transients that may give a false or oscillatory signal indication. When the amplitude of the flame signal is in excess of a predetermined amplitude an indicator is illuminated or an alarm is activated.