Patents by Inventor Leonard A. Barth

Leonard A. Barth 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).

  • Apparatus for testing hardness of wooden poles
    Patent number: 4249414
    Abstract: A method and apparatus for testing the hardness of wooden telephone and powerline poles to determine whether they are safe for climbing by linemen. A gaff is wedged into the side of the pole a preselected distance under hydraulic pressure. The maximum applied pressure is a measure of the hardness of the wood which correlates well with the results obtained during subjective tests by linemen.
    Type: Grant
    Filed: December 10, 1979
    Date of Patent: February 10, 1981
    Assignee: Northern Telecom Limited
    Inventor: Leonard A. Barth