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:
Jan. 25, 2011
Filed:
Jul. 26, 2007
Boris Zhevelev, Rishon le Zion, IL;
Yaacov Kotlicki, Ramat Gan, IL;
Boris Zhevelev, Rishon le Zion, IL;
Yaacov Kotlicki, Ramat Gan, IL;
Visonic Ltd, Tel Aviv, IL;
Abstract
A passive infrared detector assembly including a detector housing comprising a window transparent to far infrared radiation, at least one sensor sensitive to the far infrared radiation and disposed within the detector housing and an anti-masking subassembly, including at least one light guide having a serrated light aperture, the light aperture defining a plurality of teeth like portions and a plurality of grooves and being disposed close to the outside of the window, at least one infrared light emitter operative to emit near infrared radiation via the light aperture of the at least one light guide and a near infrared radiation receiver operative to receive radiation emitted by the at least one near infrared light emitter and to measure the level of received near infrared radiation and to provide a masking alarm signal upon detection of a predetermined change in the level of the received near infrared radiation.