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. 28, 1976
Filed:
Feb. 19, 1975
Applicant:
Inventor:
Howard L Tufts, Hingham, MA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
3402 / ; 340409 ;
Abstract
A fire detection system of the type utilizing an optical detector with discriminating photo-cells connected in series to form a voltage divider, with the rise in voltage at the junction of the photo-cells being utilized at the input to an amplifier to energize an alarm or activate an extinguishing system, in which a remotely controlled switch is provided for applying to the signal lead at the detector a test voltage from the remote end of the power lead at the detector, whereby both the continuity of the power lead, the continuity of the signal lead and the operativeness of the power supply are tested.