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. 03, 2011
Filed:
Aug. 21, 2003
Tadahiro Ohmi, Miyagi-ken, JP;
Yasuyuki Shirai, Miyagi-ken, JP;
Nobukazu Ikeda, Osaka, JP;
Eiji Ideta, Osaka, JP;
Akihiro Morimoto, Osaka, JP;
Tetsutaro Ogushi, Tokyo, JP;
Takehisa Konishi, Tokyo, JP;
Tadahiro Ohmi, Miyagi-ken, JP;
Yasuyuki Shirai, Miyagi-ken, JP;
Nobukazu Ikeda, Osaka, JP;
Eiji Ideta, Osaka, JP;
Akihiro Morimoto, Osaka, JP;
Tetsutaro Ogushi, Tokyo, JP;
Takehisa Konishi, Tokyo, JP;
Other;
Fujikin, Inc., Osaka, JP;
Abstract
The object of the present invention is to form a chromium-oxide film excellent in corrosion resistance without containing an oxide film of other metal onto the optional metallic material. The chromium-oxide passivation film excellent in corrosion resistance without containing the oxide film of other metal can be formed inexpensively and in a short time, and a fluid supplying system for supplying fluid hard in corrosivity in safety is able to be provided. This invention comprises a step of forming the passivation film consisting of a chromium oxide by giving heat treatment in an oxidizing atmosphere after coating chromium on metallic material of which surface roughness (Ra) of a coat surface is not more than 1.5 μm