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:
Nov. 07, 1989
Filed:
Apr. 13, 1989
Applicant:
Inventors:
Carl P Stroble, Natrona Heights, PA (US);
Anthony P More, Cheswick, PA (US);
Assignee:
Allegheny Ludlum Corporation, Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
148111 ; 148113 ;
Abstract
A method is provided for producing cube-on-edge grain-oriented silicon steel by producing 3 to 10 ppm boron and a manganese-to-sulfur and/or selenium ratio of at least 2.5 in a final gauge steel strip prior to final texture annealing and including a two-stage cold reduction wherein the final cold reduction is less than 75% to provide a steel having improved magnetic properties with a secondary grain size of less than 10 mm and a permeability of 1850 or more at 10 oersteds.