Patents by Inventor Annika M. Roos

Annika M. Roos 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).

  • Medical implant made of a stainless steel alloy
    Patent number: 4964925
    Abstract: The invention advises use of a stainless steel alloy of ferritic-austenitic structure as implant in physiological environments, said alloy containing in weight percent max 0.05% C, 23-27% Cr, 5.5-9.0% Ni, 0.25-0.40% N, max 0.8% Si, max 1.2% Mn, 3.5-4.9% Mo, max 0.5% Cu, max 0.5% W, max 0.010% S, up to 0.5% V, up to 0.18% Ce and the balance Fe and normal impurities, whereby the ferrite content amounts to 30-55%.
    Type: Grant
    Filed: April 3, 1989
    Date of Patent: October 23, 1990
    Assignee: Sandvik AB
    Inventors: Carl P. U. Hagenfeldt, Annika M. Roos