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:
Nov. 20, 1990
Filed:
Jan. 08, 1990
Eizo Naya, Amagasaki, JP;
Mitsuhiro Okumura, Amagasaki, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In manufacturing contact materials which satisfy all the criteria required for use in vacuum switches as to chopping current, circuit breaking performance, withstanding voltage, welding separation force and wear, Cu powder and Ta.sub.2 O.sub.5 powder are mixed, and compressed while heating below the melting point of Cu in a nonoxidizing atmosphere. Alternatively a green compact is first manufactured from Ta.sub.2 O.sub.5 powder or a mixture of Ta.sub.2 O.sub.5 and Cu powder, and molten Cu is made to infiltrate into the compact. Preparing a green compact from a mixture of Cu powder and Ta.sub.2 O.sub.5 powder, it may be sintered at a temperature below the melting point of Cu, re-pressed, and resintered at 400.degree.-900.degree. C. in a nonoxidizing atmosphere.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile