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. 29, 1981
Filed:
Aug. 28, 1978
Applicant:
Inventor:
John A Sadler, Rexdale, CA;
Assignee:
Chubb Industries Limited, Toronto, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08B / ; G02B / ;
U.S. Cl.
CPC ...
340531 ; 340555 ; 340556 ; 350 9615 ; 356432 ; 455610 ; 250551 ;
Abstract
In a security alarm system, connections between a local sensor unit or units and a control unit are established by flexible optical light fibre guides, a normal condition of a sensor being indicated by the maintenance of a light signal or signals passing through an associated guide from the sensor unit to the control unit where there is monitoring of at least one parameter of the signal which is dependent on the integrity of the guide.