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:
Oct. 20, 1981
Filed:
Dec. 31, 1979
Stanley B Wilkinson, Havertown, PA (US);
General Electric Company, Philadelphia, PA (US);
Abstract
A protective relay circuit includes a first a-c level detector or bi-polar threshold circuit to which a polarizing signal V.sub.POL is applied. An output is provided from the first a-c level detector only when the magnitude of V.sub.POL exceeds a predetermined value. Also included is a second a-c level detector or bi-polar threshold circuit to which an operating signal V.sub.OP is applied. An output is provided from the second a-c level detector only when the magnitude of V.sub.OP exceeds a predetermined value. The output of the first level detector is compared in a coincidence circuit with the output of the second level detector. The detection of coincidence for a predetermined time period, as measured by a characteristic timer, results in an output signal for use in controlling operation of a trip coil of a circuit breaker.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile