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:
Jul. 30, 2002
Filed:
Dec. 11, 2000
Applicant:
Inventors:
Shuuichi Kikukawa, Hitachi, JP;
Katsunori Kojima, Hitachi, JP;
Tooru Tanimizu, Hitachi, JP;
Ayumu Morita, Hitachi, JP;
Masashige Tsuji, Narashino, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R 3/1327 ; G01L 2/130 ; H01H 3/366 ; H01H 3/302 ;
U.S. Cl.
CPC ...
G01R 3/1327 ; G01L 2/130 ; H01H 3/366 ; H01H 3/302 ;
Abstract
A vacuum switch is composed by installing a vacuum circuit-breaker and a disconnector in different grounded vacuum vessels, respectively, and a vacuum-measurement device is attached to each grounded vacuum vessel. The above vacuum vessel communicates with one of the grounded vacuum vessels, and the degree of vacuum in the vacuum vessel can be directly measured and monitored.