Patents by Inventor Dennis Dean Sorensen

Dennis Dean Sorensen 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).

  • Plastic case for flat rechargeable cell
    Patent number: 4007060
    Abstract: A flat, sealed case for a secondary cell includes a flat shallow plastic base and a thin, flat plastic cover the periphery of which is sealed to the base and includes at least one internal restraint to prevent bulging of the flat cover and base upon a build-up of internal pressure within the cell case, for example during recharging.
    Type: Grant
    Filed: May 30, 1975
    Date of Patent: February 8, 1977
    Assignee: Gould Inc.
    Inventors: Dennis Dean Sorensen, Richard Allan Erickson, Harry Ellwood Iepson