Patents by Inventor Gerhard Schwichtenberg

Gerhard Schwichtenberg 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).

  • Piano soundboard
    Patent number: 4337682
    Abstract: A laminate soundboard for a piano or the like having a metal core of a modulus of elasticity and an inherent damping factor corresponding to steel of at least a grade St 34, and at least one outer cover layer of wood or plastic bonded thereto in full surface contact on each side thereof. The outer cover layers have a damping characteristic corresponding to that of wood.
    Type: Grant
    Filed: April 15, 1980
    Date of Patent: July 6, 1982
    Assignee: Wilhelm Schimmel Pianofortefabrik GmbH
    Inventor: Gerhard Schwichtenberg