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Harold E. Koeln

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  • Kirkwood, MO, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Twist actuated writing instrument
    • Patent number 4,786,197
    • Issue date Nov 22, 1988
    • Ritepoint
    • Harold E. Koeln
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    Conical pen
    • Patent number 4,257,713
    • Issue date Mar 24, 1981
    • Penn Corporation
    • Alan E. Sherman
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    Conical pen
    • Patent number 4,217,712
    • Issue date Aug 19, 1980
    • Penn Corporation
    • Harold E. Koeln
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    Twist retractable writing implement
    • Patent number 4,161,374
    • Issue date Jul 17, 1979
    • Penn Corporation
    • Harold E. Koeln
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES