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:
Jul. 04, 2000
Filed:
Apr. 13, 1998
Applicant:
Inventor:
Simon Ha, Aurora, IL (US);
Assignee:
Pittway Corporation, Chicago, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
340606 ; 340609 ; 340618 ; 340644 ; 200182 ; 200186 ; 200187 ; 200190 ;
Abstract
A flow detector includes solid state delay circuitry coupled to a flow indicating device. In response to flow being indicated, the delay circuitry is enabled. After a preset delay interval, if flow is still being indicated, electrical energy can be provided by a short circuit to an output device for the duration of indicated flow. The flow indicating device can be a two-state mechanical switch. A short circuit supplying switch can be implemented as a solid state or mechanical latching relay. The flow detector circuits can be used independently to provide local alarms. Alternately they can provide alarm indicating signals to a common alarm control panel.