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. 20, 1978
Filed:
Oct. 26, 1976
Applicant:
Inventors:
Gordon L Peters, Weirton, WV (US);
John R Smith, Richmond, OH (US);
Assignee:
National Steel Corporation, Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D / ;
U.S. Cl.
CPC ...
1131 / ; 1131 / ;
Abstract
In the production of a seam-free can body from a sheet of flow brightened electrolytic tinplate by a method involving cold forming which includes a drawing step alone or a drawing step plus a redrawing step or plus a wall ironing step to produce a cold formed cup having inherently poor corrosion resistance, the improvement which comprises heat treating the cold formed cup at a temperature ranging from about 400.degree. to about 448.degree. F. for a period of time between about 10 minutes at the lower end of the temperature range and about 10 seconds at the upper end of the temperature range.