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. 24, 1986
Filed:
Apr. 15, 1985
Applicant:
Inventors:
Keiichi Shimizu, Yamaguchi, JP;
Ryoichi Fukumoto, Yamaguchi, JP;
Assignee:
Toyo Kohan Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D / ;
U.S. Cl.
CPC ...
148 / ; 148 / ; 148 / ; 148 121 ;
Abstract
A method for manufacturing steel sheet for easy open end cans superior in openability comprising an improvement in the conventional process which includes the steps of hot rolling, first cold rolling, annealing and second cold rolling. The improvement resides in the operation of the second cold rolling reduction according to the formula: 100-0.08.times.(C+1,000.times.P)-0.8.times.H>R>20 and 45>R. This formula expresses the relationship between hardness, carbon content and cleanliness after annealing, wherein