Patents by Inventor Lars E. Liljeblad

Lars E. Liljeblad 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).

  • Drill element for percussion drilling
    Patent number: 4760887
    Abstract: The invention relates to a drill element for percussion drilling, the element having a cylindrical screw thread having one single entry. The screw thread, that is intended for thread diameters of less than 30 mm, has a pitch of less than 12 mm, a shoulder angle of less than 69.degree., and a pitch angle of less than 11.degree. but more than 5.6.degree..
    Type: Grant
    Filed: February 21, 1986
    Date of Patent: August 2, 1988
    Assignee: Santrade Limited
    Inventors: Kjell-Ove L. Jansson, Lars E. Liljeblad, Bernt S. Liljekvist