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. 15, 2007
Filed:
Sep. 02, 2003
Hiroshi Eiraku, Tokyo, JP;
Yutaka Sawano, Tokyo, JP;
Tetsuya Yamamura, Tokyo, JP;
Kuniji Yashiro, Tokyo, JP;
Fumihide Nakamura, Tokyo, JP;
Motohiro Tenmaya, Tokyo, JP;
Hiroshi Eiraku, Tokyo, JP;
Yutaka Sawano, Tokyo, JP;
Tetsuya Yamamura, Tokyo, JP;
Kuniji Yashiro, Tokyo, JP;
Fumihide Nakamura, Tokyo, JP;
Motohiro Tenmaya, Tokyo, JP;
Parker Netsushori Kogyo K.K., Tokyo, JP;
Nihon Parkerizing Co., Ltd., Tokyo, JP;
Abstract
A metal member is produced with enhanced corrosion resistance by salt bath nitriding. Specifically, in a nitriding salt bath containing Li, Naand Kions as cation components and CNOand COions as anion components and enhanced in oxidizing power by addition of an oxidizing-power-enhancing substance selected from the group consisting of alkali metal hydroxides, bound water, free water and moist air, the metal member is immersed such that an nitrided layer is formed on a surface of the metal member and concurrently, an oxide film is formed on an outermost layer of the nitrided layer. As a subsequent step to the immersion in the nitriding salt bath, the metal member is immersed in a displacement cleansing salt bath which contains an alkali metal nitrate.