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:
Aug. 06, 1991
Filed:
Jan. 26, 1990
Applicant:
Inventor:
Kiyoshi Nakama, Hiratsuka, JP;
Assignee:
Tanaka Kikinzoku Kogyo K.K., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C23C / ;
U.S. Cl.
CPC ...
148430 ; 148431 ; 148281 ; 148286 ; 204 371 ; 204 376 ;
Abstract
Disclosed herein is cobalt-containing precious metal material for decoration which comprises cobalt and one or more precious metals selected form the group consisting of Au, Ag, Pt and Pd, at least the cobalt on the surface being oxidized. Also disclosed herein is a process for preparing cobalt-containing precious metal material for decoration which comprises blending cobalt and one or more precious metals selected from the group consisting of Au, Ag, Pt and Pd, and oxidizing the blend in an oxidative atmosphere so as to form the oxidized cobalt on the surface of the material.