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. 23, 1980
Filed:
Nov. 13, 1978
Applicant:
Inventor:
David B Lederer, Rochester, NY (US);
Assignee:
Detection Systems, Inc., Fairport, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
340556 ; 250225 ; 340507 ; 340600 ;
Abstract
A single terminal detection system of the beam variety is provided with polarizing filters to sense 'near-field' problems. One filter polarizes radiation reflected back to the transceiver component and a second filter, positioned within the transceiver, polarizes radiation before it is incident upon one of two radiation detectors. Circuitry, operatively coupled to the detectors, actuates an alarm in the event either an alarm condition or a near-field problem exists.