TREA

John H. Field II

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  • Norfolk, MA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Stepping motor
    • Patent number 4,488,069
    • Issue date Dec 11, 1984
    • Sigma Instruments Inc.
    • John H. Field
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Synchronous motor system
    • Patent number 4,438,381
    • Issue date Mar 20, 1984
    • SIGMA Instruments, Inc.
    • John H. Field
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Synchronous motor system
    • Patent number 4,423,343
    • Issue date Dec 27, 1983
    • SIGMA Instruments, Inc.
    • John H. Field
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Synchronous motor system
    • Patent number 4,255,696
    • Issue date Mar 10, 1981
    • SIGMA Instruments, Inc.
    • John H. Field
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Synchronous motor with heterogeneously pitched teeth
    • Patent number 4,112,319
    • Issue date Sep 5, 1978
    • SIGMA Instruments, Inc.
    • John H. Field
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Low noise synchronous motors
    • Patent number 4,025,810
    • Issue date May 24, 1977
    • SIGMA Instruments, Inc.
    • John H. Field
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Laminar-rotor synchronous inductor motor
    • Patent number 3,956,650
    • Issue date May 11, 1976
    • Sigma Instruments Inc.
    • John H. Field
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER