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:
Mar. 11, 1980
Filed:
Mar. 13, 1978
Applicant:
Inventors:
Glenn F Cooper, Hingham, MA (US);
Robert B Enemark, Duxbury, MA (US);
Assignee:
American District Telegraph Company, Jersey City, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08B / ; G01N / ;
U.S. Cl.
CPC ...
340630 ; 250574 ;
Abstract
An optical smoke detector with a clock pulsed light source and photodiodes responding to smoke scattered light includes an alarm initiating logic circuit which delays the initiating of alarm while several samplings of smoke are sensed and then latches the logic circuit in alarm condition.