Patents by Inventor L. Keith Johnson

L. Keith Johnson 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).

  • Riser marking tool
    Patent number: D416210
    Type: Grant
    Filed: November 30, 1998
    Date of Patent: November 9, 1999
    Inventor: L. Keith Johnson
  • Triangular marking tool
    Patent number: D423957
    Type: Grant
    Filed: April 12, 1999
    Date of Patent: May 2, 2000
    Inventor: L. Keith Johnson