Patents by Inventor Nils-Gunnar Malmgren

Nils-Gunnar Malmgren 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).

  • Patent number: 4295900
    Abstract: A rolled wire or rod of stainless steel having a fine-grain structure and intended for the manufacture of drawn spring wire and rope wire of high mechanical strength and high ductility. The carbon content, 0.04-0.07%, is much lower than in conventional stainless steels for spring wire and rope wire, and the nickel and chromium contents, 8-9.5% and 18-19% respectively, have been adjusted to said carbon content such that a chromium content of 18% corresponds to a nickel content of 8.0-8.8% when the carbon content is 0.04% and to a nickel content of 8.8-9.5% when the carbon content is 0.07%, and a chromium content of 19% corresponds to a nickel content below 8.3% when the carbon content is 0.04% and to a nickel content of 8.4-9.2% when the carbon content is 0.07%. The grain size of the wire or rod is 8-13 ASTM, preferably 10-12 ASTM.
    Type: Grant
    Filed: May 26, 1978
    Date of Patent: October 20, 1981
    Assignee: Fagersta AB
    Inventors: Nils-Gunnar Malmgren, Barry Solly, Stig Tarnblom