Patents by Inventor Richard C. Gulbrandsen

Richard C. Gulbrandsen 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).

  • Method and means of manufacturing a rotary cutting tool
    Patent number: 4383784
    Abstract: The production of rotary cutting tools using very small amounts of premium alloy steel such as tungsten or cobalt as the primary cutting or wearing surface welded to a longer lower grade of tool steel as the secondary wearing or cutting surface.
    Type: Grant
    Filed: October 16, 1981
    Date of Patent: May 17, 1983
    Assignee: Precision Twist Drill & Machine Co.
    Inventor: Richard C. Gulbrandsen