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:
Mar. 12, 1985
Filed:
Nov. 07, 1983
Applicant:
Inventor:
Nobuo Furuno, Hyogo, JP;
Assignee:
Nippon Paint Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23F / ; C23F / ;
U.S. Cl.
CPC ...
148 / ; 148-62 ; 148-627 ; 148-624 ;
Abstract
A method for the treatment of aluminum or aluminum alloy material comprising treating the material in a series of alkaline baths and a series of acid baths connected in series in regular order, said alkaline baths having an alkali concentration gradient continually decreasing from higher to lower values, the alkali concentration in the last stage bath being controlled to a defined level, and said acid baths having an acid concentration gradient continually decreasing from higher to lower values and the last stage bath being of pure water. The aluminum or aluminum alloy surface can be processed uniformly and economically by the instant process.