TREA

John B. Littlefield

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  • Belle Haven, VA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Composition friction element for a railroad brake shoe
    • Patent number 4,313,869
    • Issue date Feb 2, 1982
    • AMSTED Industries Incorporated
    • John B. Littlefield
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Composite friction element
    • Patent number 4,219,452
    • Issue date Aug 26, 1980
    • AMSTED Industries Incorporated
    • John B. Littlefield
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    Method and apparatus for making composition friction materials
    • Patent number 4,169,680
    • Issue date Oct 2, 1979
    • AMSTED Industries Incorporated
    • John B. Littlefield
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
  • Information Patent Grant

    Friction materials
    • Patent number 4,072,650
    • Issue date Feb 7, 1978
    • John B. Littlefield
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...