Patents by Inventor Wolf-Christoph Friebel

Wolf-Christoph 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
    Publication number: 20080153410
    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: Application
    Filed: November 13, 2007
    Publication date: June 26, 2008
    Applicant: NABER HOLDING GmbH & Company KG
    Inventors: Hans-Joachim Naber, Wolf-Christoph Friebel