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:
Jun. 22, 2004
Filed:
Apr. 09, 2002
Applicant:
Inventors:
Yohei Asakawa, Yokohama, JP;
Hideaki Onozuka, Sagamihara, JP;
Motohiro Kikuchi, Hitachi, JP;
Yoshio Koguchi, Hitachiota, JP;
Masato Kobayashi, Hitachi, JP;
Masaya Takahashi, Hitachi, JP;
Shigeru Kikuchi, Tokai, 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
An electrode comprises an electrode main body having a porosity, and the conductivity of the electrode main body at its part ranging from the arc running face to a stated depth is made higher than the conductivity at the section or the conductivity at the part ranging from the back surface to a stated depth. This brings about an improvement in circuit-break performance of a circuit breaker and also prevents the arc running face of the electrode main body from deteriorating.