TREA

Douglas A. Schaffer

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  • Inver Grove Heights, MN, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Tape supply cartridge
    • Patent number 4,678,353
    • Issue date Jul 7, 1987
    • Kroy Inc.
    • Michael M. Richardson
    • B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
  • Information Patent Grant

    Lettering apparatus
    • Patent number 4,624,590
    • Issue date Nov 25, 1986
    • Kroy Inc.
    • Michael M. Richardson
    • B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
  • Information Patent Grant

    Tape supply cartridge
    • Patent number 4,557,617
    • Issue date Dec 10, 1985
    • Kroy, Inc.
    • Michael M. Richardson
    • B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS