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:
Jul. 12, 1988
Filed:
Oct. 24, 1984
Applicant:
Inventors:
Jose L Gazapo, Alicante, ES;
Dan Fern, Kingston, CA;
Assignee:
Alcan International Limited, Montreal, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23C / ; C23C / ;
U.S. Cl.
CPC ...
148-627 ; 427343 ; 4274192 ;
Abstract
Aluminum articles having porous anodic oxide films are given an exposure-resistant blue coloration by dipping them first in an aqueous solution of a phosphomolybdic acid or a silicomolybdic acid, and then in a solution of a strong reducing agent such as a stannous salt, and finally sealing the porous oxide film. The method is suitable for batch or continuous operation and useful to color bumpers for passenger cars.