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:
Jul. 27, 1999
Filed:
Apr. 01, 1997
Fumitoshi Yamashita, Ikoma, JP;
Katsuhiro Murano, Ootsu, JP;
Seiji Kurozumi, Osaka, JP;
Kazunori Hayashi, Futtsu, JP;
Kanao Fukuda, Kawasaki, JP;
Masato Inayoshi, Kashiwa, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
A motor bearing device includes a bearing member, and a rotary shaft made of steel into which ions of metal element and carbon ions are implanted via a surface of the rotary shaft. The rotary shaft is slidable relative to the bearing member. The metal element is selected from the group consisting of metal elements in the IVa, Va, and VIa groups of the periodic system. Lubricant is provided between the bearing member and the rotary shaft. The surface of the rotary shaft opposes the bearing member.