Clipboard (16) Patents (Class D19/88)
  • Combined clipboard and timer
    Patent number: D243688
    Type: Grant
    Filed: June 30, 1975
    Date of Patent: March 15, 1977
    Assignee: Quartz Timing Corporation
    Inventors: George Keyko, Robert H. Esslinger
  • Combined work case, pad holder and calculator
    Patent number: D253438
    Type: Grant
    Filed: September 6, 1977
    Date of Patent: November 20, 1979
    Inventor: Harold T. Markley
  • Combined writing board and pad holder
    Patent number: D254794
    Type: Grant
    Filed: April 25, 1978
    Date of Patent: April 22, 1980
    Assignee: Safeguard Business Systems, Inc.
    Inventors: Eric R. Hayman, John C. Hensel, Ingomar O. Koch
  • Combined portable container and clipboard
    Patent number: D255251
    Type: Grant
    Filed: April 26, 1978
    Date of Patent: June 3, 1980
    Assignee: Handesk Limited
    Inventors: William S. Hansen, Bryan E. S. Ruskin