Patents Assigned to Cardinal American Corporation
  • Combined fireplace heater and grate
    Patent number: D253274
    Type: Grant
    Filed: November 2, 1977
    Date of Patent: October 30, 1979
    Assignee: Cardinal American Corporation
    Inventor: Donald A. Boyd
  • Fireplace heater
    Patent number: D253718
    Type: Grant
    Filed: January 5, 1978
    Date of Patent: December 18, 1979
    Assignee: Cardinal American Corporation
    Inventors: Donald A. Boyd, Allen W. Gale