Patents by Inventor Otto Birker

Otto Birker 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).

  • Sound absorbing panel for interior walls
    Patent number: 5024290
    Abstract: A sound absorbing panel (1) is disclosed having several grooves (3a,3b) opening in the shape of a funnel in parallel opposite surfaces. At their intersections the grooves (3a, 3b) form relatively small holes. The grooves (3a, 3b) exhibit a funnel-shaped cross-section, as a result of which sound emerging behind the panel (1) is dissipated and effectively absorbed in a backing layer consisting, for example, of fiber glass. The panel (1) is flexible and reflects incident light well.
    Type: Grant
    Filed: March 16, 1990
    Date of Patent: June 18, 1991
    Assignee: Lignoform Benken AG
    Inventor: Otto Birker