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:
Dec. 17, 2002
Filed:
Oct. 03, 2000
Applicant:
Inventors:
Masashige Tsuji, Narashino, JP;
Ayumu Morita, Hitachi, JP;
Toru Tanimizu, Hitachi, JP;
Katsunori Kojima, Hitachi, JP;
Yuichi Ishikawa, Mito, JP;
Yoshiharu Yotsumoto, Tokyo, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01H 3/366 ;
U.S. Cl.
CPC ...
H01H 3/366 ;
Abstract
A vacuum exhaust element of a vacuum switch has an ordinary withstand voltage because the vacuum vessel and power source element are grounded, therefore not requiring the high voltage to be taken into consideration. This way, the vacuum exhaust element is miniaturized and it is safe for a worker to touch the vacuum vessel and the vacuum exhaust element when performing maintenance and/or inspection.