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Richard D. Campbell

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  • Swissvale, PA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Electronic bipolar interface circuit
    • Patent number 4,763,017
    • Issue date Aug 9, 1988
    • American Standard Inc.
    • Richard D. Campbell
    • H03 - BASIC ELECTRONIC CIRCUITRY
  • Information Patent Grant

    Fail-safe pulse coincidence detector
    • Patent number 4,661,722
    • Issue date Apr 28, 1987
    • American Standard Inc.
    • Richard D. Campbell
    • H03 - BASIC ELECTRONIC CIRCUITRY
  • Information Patent Grant

    Fail-safe digital comparator
    • Patent number 4,328,541
    • Issue date May 4, 1982
    • American Standard Inc.
    • Richard D. Campbell
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    Fail-safe decoder for digital track circuits
    • Patent number 4,320,881
    • Issue date Mar 23, 1982
    • American Standard Inc.
    • Richard D. Campbell
    • B61 - RAILWAYS
  • Information Patent Grant

    Non-linear filter
    • Patent number 4,306,695
    • Issue date Dec 22, 1981
    • American Standard Inc.
    • Richard D. Campbell
    • H03 - BASIC ELECTRONIC CIRCUITRY