Patents by Inventor Friedhelm Zimmer

Friedhelm Zimmer 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).

  • Aircraft with shrouded propeller drive
    Patent number: 3968944
    Abstract: This invention relates to an improvement in an aircraft having a tail-mounted, shrouded pusher-type propeller and an engine mounted in front of the shroud, the improvement comprising exhaust pipe running from the engine to the shroud.
    Type: Grant
    Filed: February 27, 1975
    Date of Patent: July 13, 1976
    Assignee: Dornier GmbH
    Inventors: Friedhelm Zimmer, Zimmer Herbert