Patents by Inventor Wolf-Christopher Friebel

Wolf-Christopher Friebel 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).

  • Wall sleeve
    Patent number: 8721410
    Abstract: The invention relates to a wall sleeve with a ventilation opening at a guide tube (2), and a cover plate (5), which is mounted at the end of the guide tube and can be moved between a closing position and an open position, said cover plate (5) automatically opening and closing against a reset force, propelled by the pressure difference between the air pressure in the guide tube (2) and the external ambient air.
    Type: Grant
    Filed: November 13, 2007
    Date of Patent: May 13, 2014
    Assignee: Naber Holding GmbH & Co. KG
    Inventors: Wolf-Christopher Friebel, Hans-Joachim Naber