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. 26, 1989
Filed:
Jan. 29, 1988
Applicant:
Inventors:
John L Corl, El Sobrante, CA (US);
Gregory S Triplett, Richmond, CA (US);
Assignee:
Systron-Donner Corp., Concord, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
G08B / ; G08B / ;
U.S. Cl.
CPC ...
340630 ; 340514 ; 340945 ;
Abstract
A light scatter smoke detector includes an infrared light source and light sensor in a smoke chamber, the chamber including an adjustable screw which serves as a scatter reflector to provide an operating voltage used both in normal operation and for testing. A dual channel is also provided by a splitting off some light from the light source into a separate reference channel which is also used for threshold detection or proper ratioing.