Patents Represented by Attorney, Agent or Law Firm Dewey Cheatum Howe
  • 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