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:
Nov. 30, 1976
Filed:
Apr. 03, 1975
Applicant:
Inventor:
Malcolm F MacDonald, Chelmsford, MA (US);
Assignee:
Electronics Corporation of America, Cambridge, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01V / ; G01N / ;
U.S. Cl.
CPC ...
328-6 ; 307308 ; 328-1 ; 3402 / ; 3402282 ;
Abstract
A flame responsive system includes a flame sensor, flame signal generating circuitry responsive to the flame sensor and flame signal inhibiting circuitry also responsive to the flame sensor. A fast filter and a slower filter are coordinated so that total loss of flame sensor response results in rapid termination of a flame signal output from the flame signal generating circuitry while reduction of a flame sensor response below a set point causes the flame signal inhibiting circuitry to inhibit the flame signal output.