Patents by Inventor Karl-Heinz Sperling

Karl-Heinz Sperling 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).

  • Tile-wall assembly with closure panel
    Patent number: 4910937
    Abstract: A wall opening in a tile wall is closed by tile panel which is held in place by a spring-loaded snap catch at one edge of the rear of the panel and along the opposite edge by a channel engaging a tongue.
    Type: Grant
    Filed: November 2, 1987
    Date of Patent: March 27, 1990
    Inventor: Karl-Heinz Sperling