Patents by Inventor Paul W. Niehaus

Paul W. Niehaus 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).

  • Acoustical door
    Patent number: 5416285
    Abstract: An acoustical door including a multiple ply core with individual plies separated from one another by intervening spacer networks. The networks provide generally uniform sound damping spaces between the core plies and are glued in position between the plies to bond the core together.
    Type: Grant
    Filed: December 17, 1993
    Date of Patent: May 16, 1995
    Assignee: Eggers Industries
    Inventor: Paul W. Niehaus