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:
Feb. 13, 1979
Filed:
Jun. 02, 1977
Kenneth C Shuey, Cridersville, OH (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
Individual rectified phase voltages are produced and applied to individual opto-isolator units whose output photo diodes are connected in a series string. Each photo diode has a zener diode connected across it with the zener diodes mutually connected in series. A direct voltage applied to the photo diode string is blocked unless one of the photo diodes is made conductive by having received radiation indicative of an overcurrent condition. The responsive photo diode forms a current conduction path with the zener diodes across each of the other photo diodes, which latter may remain nonconductive, for developing at terminals a direct voltage upon occurrence of a predetermined overcurrent, which voltage is useful for application to a trip circuit or the like for interruption of the load circuit in which the overcurrent occurs.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile