Patents by Inventor Lowell L. Bjorklund

Lowell L. Bjorklund 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: 4295351
    Abstract: A process for producing self-tapping screws from an austenitic 300 series stainless steel material wherein a blank of such material is chilled prior to a thread rolling operation so that the threads are formed while the blank is in a chilled condition. A preferred apparatus for practicing such a method utilizes an insulated tunnel surrounding the feed track which leads to the thread roller. Fluid refrigerant is fed to the interior of the tunnel to chill the blanks immediately prior to the thread rolling operation.
    Type: Grant
    Filed: January 8, 1979
    Date of Patent: October 20, 1981
    Assignee: Illinois Tool Works Inc.
    Inventors: Lowell L. Bjorklund, Ramon A. Berg, Henry A. Sygnator
  • Patent number: 4233880
    Abstract: A drilling and tapping screw constructed from a 300 series stainless steel material which has the corrosive resistance of the high chromium high nickel content stainless steel while still being capable of drilling through carbon steel materials or the like. The product is constructed by forging the point at very slow forging speeds, resulting in a drill screw which is a predominantly martensitic structure at the drill point while predominantly austenitic in the shank and head regions.
    Type: Grant
    Filed: July 20, 1978
    Date of Patent: November 18, 1980
    Assignee: Illinois Tool Works Inc.
    Inventors: Lowell L. Bjorklund, Ramon A. Berg, George A. Friedland