Patents by Inventor Elmer A. Lindemann

Elmer A. Lindemann 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).

  • Self-closing door hinge
    Patent number: 4406034
    Abstract: A self-closing door hinge for a curtain door mounted within a frame consisting of a channel having a double helical track and a roller on said helical track which is returned to a pre-selected position after movement in either direction by compression of a spring thereby moving an arm carrying a curtain door connected to said channel to a preselected position.
    Type: Grant
    Filed: July 21, 1981
    Date of Patent: September 27, 1983
    Assignee: Superior Door Corporation
    Inventor: Elmer A. Lindemann