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:
Oct. 26, 1976
Filed:
Dec. 12, 1973
Applicant:
Inventor:
William F Doherty, Halifax, MA (US);
Assignee:
Pyrotector, Incorporated, Hingham, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
3402 / ; 250339 ; 250554 ; 3402 / ; 340409 ;
Abstract
A detector system particularly adapted for use in installation where the supply voltage is subject to wide variations comprises a detector which produces a voltage in response to a condition to be detected, a supervisory circuit, and an alarm actuator, in which the voltage signal produced by the detector when the predetermined condition exists, varies in proportion to line voltage, the alarm actuating means produces an alarm when the input signal rises to a predetermined percentage of the line voltage, and the supervisory circuit applies to the signal lead a supervisory voltage which also varies in proportion to the variation of line voltage.