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Douglas Ritchie

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  • Stowe, MA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

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    • Patent number 4,693,613
    • Issue date Sep 15, 1987
    • By Design Corp.
    • Douglas Ritchie
    • G04 - HOROLOGY
  • Information Patent Grant

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    • Patent number 4,674,891
    • Issue date Jun 23, 1987
    • By Design Corp.
    • Douglas Ritchie
    • G04 - HOROLOGY