Patents by Inventor Friedrich Ullner

Friedrich Ullner 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).

  • Airtight closing sliding door with contact pressure and integrated one-hand operation
    Patent number: 4731950
    Abstract: An improved airtight closing sliding door with contact pressure and integrated one-hand operation which lowers itself in its closed position and thereby hermetically seals the door frame as well as the door sill by way of continuously effective contact pressure whose door leaf is suspended from the cam plate of a carrying shaft, and which is lowered from horizontally to vertically downwards position by turning the carrying shaft.
    Type: Grant
    Filed: June 30, 1986
    Date of Patent: March 22, 1988
    Assignee: Ing. Friedrich Ullner, Bautechnische Kuehlraumausstattung
    Inventor: Friedrich Ullner