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:
Feb. 27, 1979
Filed:
Nov. 29, 1977
Sankichi Shida, Nara, JP;
Shinji Okuma, Moriguchi, JP;
Mashiro Oita, Kashiwara, JP;
Hyogo Hirohata, Neyagawa, JP;
Abstract
An electrical contact material comprising silver, bismuth oxide and tin oxide with or without tin metal, wherein the amounts of the bismuth and the tin on the basis of the sum weight of the metals in both the metal component and in the metal oxide component are 1.5 to 6 weight percent and 0.1 to 6 weight percent, respectively. This electrical contact material has high resistance to both welding and arc erosion. An advantageous method of making the electrical contact material comprises preparing a metal alloy composed of all the above metals in the above weight ratio and internally oxidizing the bismuth completely in the alloy after shaping the alloy to a desired electrical contact material shape or after crushing the alloy to scaly flakes.