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. 12, 1979
Filed:
Jun. 22, 1978
Applicant:
Inventors:
Tsuneo Inui, Tokuyama, JP;
Hitoshi Kuroda, Kudamatsu, JP;
Kenji Hizuka, Kudamatsu, JP;
Hideaki Hamano, Kudamatsu, JP;
Assignee:
Migita Patent Office, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C25D / ; C25D / ;
U.S. Cl.
CPC ...
204 41 ; 204 29 ;
Abstract
A method for the pretreatment of tin-free steel which comprises a cathodic treatment after an anodic treatment of a degreased steel sheet in an acid chromate electrolyte, said steel sheet consisting of an upper layer of hydrated chromium oxide and a lower layer of metallic chromium. This pretreated tin-free steel has excellent lacquer adhesion after aging in hot water and under retort conditions.