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:
May. 20, 2014
Filed:
Apr. 08, 2011
Fukutaro Kato, Chiyoda-ku, JP;
Eiichi Nagao, Chiyoda-ku, JP;
Tsuyoshi Amimoto, Chiyoda-ku, JP;
Yoshio Kimura, Chiyoda-ku, JP;
Noboru Hosokawa, Chiyoda-ku, JP;
Junji Tanimura, Chiyoda-ku, JP;
Satoru Toyama, Chiyoda-ku, JP;
Fukutaro Kato, Chiyoda-ku, JP;
Eiichi Nagao, Chiyoda-ku, JP;
Tsuyoshi Amimoto, Chiyoda-ku, JP;
Yoshio Kimura, Chiyoda-ku, JP;
Noboru Hosokawa, Chiyoda-ku, JP;
Junji Tanimura, Chiyoda-ku, JP;
Satoru Toyama, Chiyoda-ku, JP;
Mitsubishi Electric Corporation, Chiyoda-Ku, Tokyo, JP;
Abstract
The present invention provides a method for inhibiting production of copper sulfide in an electrical insulating oil inside an oil-filled electrical apparatus, including adding a benzotriazole compound not having a long-chain alkyl group when the oil-filled electrical apparatus is an open-type oil-filled electrical apparatus, or adding a benzotriazole compound having a long-chain alkyl group when the oil-filled electrical apparatus is a closed-type oil-filled electrical apparatus.