Patents by Inventor Frederick M. Berk

Frederick M. Berk 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).

  • Disposable mixing wells
    Patent number: 6000535
    Abstract: An article of manufacture and a method of making same wherein a plurality of mixing wells is formed as a unitary sheet of individual mixing wells arranged in rows and columns. The boundary between each mixing well is scored, perforated, or otherwise made to allow individual pieces to be removed from the sheet. Preferably, the mixing wells may be pressure formed rather than being vacuum formed.
    Type: Grant
    Filed: February 18, 1998
    Date of Patent: December 14, 1999
    Assignee: Pulpdent Corporation
    Inventors: Kenneth J. Berk, Frederick M. Berk, Donald Berk