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:
Dec. 15, 1998
Filed:
Apr. 23, 1997
Applicant:
Assignee:
Pittway Corporation, Chicago, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
340512 ; 340506 ; 327 18 ;
Abstract
A pulse detection circuit to be used in combination with a generator of a train of synchronizing pulses. The detection circuitry remains in a first, inactive state in the presence of an ongoing sequence of synchronization pulses. In the event of a detected absence of synchronizing pulses for a predetermined period of time, the detection circuitry changes state and generates an electrical output signal indicative of one or more missing synchronizing pulses. The detection circuitry can incorporate either digital or analog timing circuitry.