Patents by Inventor Douglas James Adelman

Douglas James Adelman 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).

  • Double-sided scalene triangle puzzle
    Patent number: D457199
    Type: Grant
    Filed: May 30, 2001
    Date of Patent: May 14, 2002
    Inventor: Douglas James Adelman
  • Scalene triangle puzzle
    Patent number: D429775
    Type: Grant
    Filed: August 2, 1999
    Date of Patent: August 22, 2000
    Assignee: Douglas Adelman
    Inventor: Douglas James Adelman