Patents by Inventor Walter Zimnik

Walter Zimnik has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Cold rolled sheet or strip steel and a process for production thereof
    Patent number: 5139580
    Abstract: In order to produce sheet possessing good forming properties, in particular for rotationally symmetrical deep-drawings, a low-carbon steel containing not more that 0.009% N is alloyed with 0.01 to 0.94% Ti and in certain cases with 0.01 to 0.06% Nb and continuously cast. The plate slabs are heated to a temperature above 1120 degrees Celsius, rolled to obtain a hot strip above the Ar.sub.3 point, and would at 520.+-.100 degrees Celsius. After cold rolling to the desired fine sheet thickness, the steel strip is annealed by recrystallizaiton, skin-passes and made into sheets.
    Type: Grant
    Filed: July 18, 1990
    Date of Patent: August 18, 1992
    Assignee: Stahlwerke Peine-Salzgitter AG
    Inventors: Klaus Freier, Walter Zimnik