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Clark E. Johnson Jr.

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  • Minneapolis, MN, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Noise reduction system
    • Patent number 4,492,990
    • Issue date Jan 8, 1985
    • Vertimag Systems Corporation
    • Clark E. Johnson
    • G11 - INFORMATION STORAGE
  • Information Patent Grant

    Analog recording system
    • Patent number 4,451,858
    • Issue date May 29, 1984
    • Vertimag Systems Corporation
    • Clark E. Johnson
    • G11 - INFORMATION STORAGE