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:
Sep. 03, 1991
Filed:
Feb. 27, 1990
Tsutomu Okutomi, Yokohama, JP;
Mikio Okawa, Tama, JP;
Atsushi Yamamoto, Fuchu, JP;
Tsuneyo Seki, Fuchu, JP;
Yoshinari Satoh, Kawasaki, JP;
Mitsutaka Honma, Tokorozawa, JP;
Seishi Chiba, Yokohama, JP;
Tadaaki Sekiguchi, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A contact forming material for a vacuum interrupter comprising: from 25% to 65% by weight of a highly conductive component comprising Ag and Cu, and from 35% to 75% by weight of an arc-proof component selected from the group consisting of Ti, V, Cr, Zr, Mo, W and their carbides and borides, and mixtures thereof wherein the highly conductive component of the contact forming material comprises (i) a first highly conductive component region composed of a first discontinuous phase having a thickness or width of no more than 5 micrometers and a first matrix surrounding the first discontinuous phase, and (ii) a second highly conductive component region composed of a second discontinuous phase having a thickness or width of at least 5 micrometers and a second matrix surrounding the second discontinuous phase, wherein the first discontinuous phase in the first highly conductive component region is finely and uniformly dispersed in the first matrix at intervals of no more than 5 micrometers, and wherein the amount of the second highly conductive component region based on the total highly conductive component is within the range of from 10% to 60% by weight.