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:
Jun. 30, 1992
Filed:
Apr. 20, 1990
Alan P Doctor, Sea Cliff, NY (US);
Pittway Corporation, Syosset, NY (US);
Abstract
An intrusion detection system includes an array of infrared radiation-sensitive elements, each element comprises first and second spaced electrodes between which pyroelectric material is positioned, and each element is operative to produce a voltage proportional to the rate of change of infrared radiation incident thereon. A pair of oppositely poled detector elements is connected to a first signal processing channel and a second pair of oppositely poled detector elements is connected to a second signal processing channel. The system also includes coincidence means such that an alarm output in response is produced in response to concurrent application of intruder signals of opposite polarity to the two signal processing channels.