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. 19, 2001
Filed:
Sep. 17, 1998
Katsuhiro Komuro, Hitachi, JP;
Yoshitaka Kojima, Hitachi, JP;
Noboru Baba, Hitachiohta, JP;
Ryo Hiraga, Hitachiohta, JP;
Toru Tanimizu, HItachi, JP;
Yoshimi Hakamata, Hitachi, JP;
Katsumi Kuroda, Hitachi, JP;
Hitoshi Okabe, Hitachi, JP;
Shigeru Kikuchi, Tokai-mura, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Disclosed is a vacuum circuit breaker including a small-sized electrode structure capable of reducing deformation with age thereby enhancing the reliability and a vacuum bulb and a vacuum bulb electrode used for the breaker. In the vacuum circuit breaker, each of a fixed electrode and a movable side electrode includes an arc electrode made from particles of a refractory metal material, a high conductive metal material and a low melting point metal; an electrode supporting portion, made from the high conductive metal material, for supporting the arc electrode; a back conductor having a diameter smaller than the electrode supporting portion; and an external side connecting portion having a diameter larger than that of the back conductor. The arc electrode is integrated with the electrode supporting portion, back conductor, and external side connecting portion by the high conductive metal material, preferably, by melting of the highly conductive metal material.