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:
Dec. 29, 1992
Filed:
Mar. 09, 1992
Applicant:
Inventors:
Akio Uesugi, Shizuoka, JP;
Tsutomu Kakei, Shizuoka, JP;
Assignee:
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C25F / ;
U.S. Cl.
CPC ...
20412943 ; 20412975 ;
Abstract
A method of producing an aluminum support for a printing plate by electrochemical graining. The aluminum support is soaked in an acid electrolytic liquid of nitric acid or hydrochloric acid in preferred ranges. An alternating current including a t.sub.F positive period and a t.sub.R negative period is applied between the aluminum support and an opposite electrode, with current reach peak levels in the positive period t.sub.F and the negative period t.sub.R being reached within the initial range of 0.1-20% of either period.