Patents by Inventor David W. Liedholm

David W. Liedholm 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).

  • Flat conductor to round conductor connection system
    Patent number: 4339167
    Abstract: There is disclosed herein power connection clamp pads shaped to fit the contour of conductors to be attached to terminal blocks for insertion into known terminal block assemblies.
    Type: Grant
    Filed: March 13, 1980
    Date of Patent: July 13, 1982
    Assignee: Raychem Corporation
    Inventor: David W. Liedholm
  • Method of forming a strip heater expansion joint
    Patent number: 4235012
    Abstract: An expansion joint for metallic foil strip heaters encasing resistive heating elements comprised of a bend formed in the metallic foil strips. The expansion joint is formed by use of a tool for passing a roller in the tool handle over a rigid forming support affixed to the tool bottom forming plate with the metallic foil strip heater placed between the roller and the forming support. The tool is then removed and a flexible metal support hose is affixed to the object to be heated with the bend in the metallic foil strips placed over this support hose. The bend is then affixed to the object to be heated on either side of the support hose.
    Type: Grant
    Filed: August 31, 1978
    Date of Patent: November 25, 1980
    Assignee: Raychem Corporation
    Inventor: David W. Liedholm