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. 15, 1994
Filed:
Mar. 25, 1991
Tien-Cheng Hu, Hsinchu, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
Disclosed is a circuit device enabling an electromagnetic switch to be used with an A.C. power source. And the coil is thereof provided with a more stable electromagnetic field. The circuit device includes a releasing voltage detecting circuit, an engaging voltage detecting circuit, an nonstandard AND gate circuit connected to the detecting circuits, and a coil-holding circuit connected so that when there is an engaging voltage in the circuit device, the electromagnetic switch is energized and the coil is kept in a holding state. When there is a releasing voltage, the switch is de-energized.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile