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:
Jun. 08, 1976
Filed:
Nov. 21, 1973
Yuichi Yoshida, Ageo, JA;
Akio Takagi, Yokohama, JA;
Nippon Paint Co., Ltd., Osaka, JA;
Abstract
A method for chemical treatment of the surface of an iron substrate which comprises (a) treating the surface with an aqueous solution containing phosphoric acid in a concentration of 0.5 to 80 weight/volume %, (b) subjecting the surface without water rinsing to treatment with an aqueous solution containing phosphoric acid with a substance capable of reacting with the phosphoric acid to give a water-soluble salt, which is hydrolyzed and/or reacted with the iron substrate to form a volatile base, and/or a substance capable of reacting with the phosphoric acid to give a water-soluble salt, which is hydrolyzed and/or reacted with the iron substrate to form a non-volatile base, the pH of the aqueous solution being 1 to 9, the total ion concentration being 0.2 to 8 weight/volume % and the concentration of the cation from the latter substance being not more than 0.5 weight/volume %, and (c) drying the surface without water rinsing.