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. 15, 1981
Filed:
Jul. 05, 1979
Vincent Y Chow, Hanover Park, IL (US);
Ellsworth, Chow & Murphy, Inc., Palo Alto, CA (US);
Abstract
A domestic protective system which utilizes existing household AC power lines to conduct system signals between remote stations or zones and a master receiver. The system signals are established by a single carrier frequency and include a data pulse of this frequency under normal conditions, and no data pulse under malfunction conditions. Locations of zones originating system data signals are identified by time delays established prior to data transmission from each zone, this delay triggered and synchronized by data transmissions transmitted from other zones.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile