Patents by Inventor Karl H. Linden

Karl H. Linden 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).

  • Extensible drill
    Patent number: 4561812
    Abstract: An extensible drill assembly comprising a plurality of separate drill members having different drill diameters which are arranged to permit assembly of two or more of the drill members into a continuous drill combination having a stepwise increasing diameter from the outermost drill member.
    Type: Grant
    Filed: June 9, 1983
    Date of Patent: December 31, 1985
    Inventor: Karl H. Linden