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:
Sep. 29, 2009
Filed:
Jul. 19, 2001
Kazuhiro Takahashi, Hikari, JP;
Teruhiko Hayashi, Hikari, JP;
Michio Kaneko, Futtsu, JP;
Kiyonori Tokuno, Tokyo, JP;
Junichi Tamenari, Hikari, JP;
Kinichi Kimura, Tokyo, JP;
Kazuhiro Takahashi, Hikari, JP;
Teruhiko Hayashi, Hikari, JP;
Michio Kaneko, Futtsu, JP;
Kiyonori Tokuno, Tokyo, JP;
Junichi Tamenari, Hikari, JP;
Kinichi Kimura, Tokyo, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
Titanium material less susceptible to discoloration and method for thereof are provided. Titanium materials less susceptible to discoloration in the atmosphere are obtainable by controlling the fluorine and carbon contents in the oxide film on the surface thereof and the thickness of the oxide film. Such titanium materials are obtainable by dissolving the surface thereof in an aqueous fluonitric acid solution with a nitric acid concentration of not higher than 80 g/l or heat-treating at between 300 and 900° C. in a vacuum or in an inert gas atmosphere of argon or helium after dissolving in the aqueous fluonitric acid solution.