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. 22, 2000
Filed:
Feb. 27, 1997
Applicant:
Inventors:
Kenichi Koyama, Tokyo, JP;
Yukimori Kishida, Tokyo, JP;
Hiroyuki Sasao, Tokyo, JP;
Hiroshi Yamamoto, Tokyo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
327438 ; 327441 ; 327108 ;
Abstract
A switching device has a control section to transfer a gate control signal which switches plural thyristors from an ON state to an OFF state after a parallel switch is open and an opening degree of the parallel switch is met where no arc discharge is generated at a contact point in the parallel switch.