Patents by Inventor David C. Townend

David C. Townend 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 hangar door arrangement
    Patent number: 4971129
    Abstract: A hanger door arrangement which comprises a door having two upper door panels adapted to be pivotally connected to the top of the hanger door opening in side-by-side relationship and two lower door panels pivotally connected to the lower edges of the upper panels, and an operating mechanism which raises the door to an open position in which the lower panels allow passage of the wings of an aircraft beneath them and the tailgate between them.
    Type: Grant
    Filed: January 16, 1990
    Date of Patent: November 20, 1990
    Inventor: David C. Townend