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:
Nov. 03, 1992
Filed:
Jun. 19, 1990
Kenzo Kobayashi, Inukura, Miyamae-ku, Kawasaki-shi, Kanagawa, JP;
Kenichi Shimizu, Kyouwa, Sagamihara-shi, Kanagawa, JP;
Hideaki Yoshioka, Sendai, JP;
Other;
Yoshida Kogyo K.K., Tokyo, JP;
Abstract
The present invention provides a process for coloring titanium, or its alloys which comprises the steps of anodizing titanium metal, or its alloy in an electrolytic solution until the voltage reaches a predetermined voltage at a constant current temporarily cutting off the current supply to interrupt the anodizing; and then supplying a direct current again at a predetermined current density to continue anodizing, wherein the color tone of the anodic oxide film formed on the titanium or its alloy is adjusted by controlling the supplied amount of current, without causing an increase in voltage. By the coloring process of the present invention, the color of titanium metal or its alloys can be changed to various color tones at low voltages.