Patents by Inventor Fred C. Saffrahn

Fred C. Saffrahn 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).

  • Safety roller assembly for plug doors
    Patent number: 4142328
    Abstract: A safety roller assembly in a plug door for a railway car is disclosed which includes a safety roller traveling in a retaining guide with a recess being formed in the lower support surface of the retaining guide to receive a safety crank connected to the safety roller when the plug door is closed. A safety shoe is provided beneath the safety roller to prevent it from ever falling through the recess in the lower support surface.
    Type: Grant
    Filed: September 19, 1977
    Date of Patent: March 6, 1979
    Assignee: Pullman Incorporated
    Inventor: Fred C. Saffrahn