TREA

Donald M. Barnhart

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  • Martinsburgh, WV, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Rocker barrel configuration
    • Patent number 4,757,648
    • Issue date Jul 19, 1988
    • Pangborn Corporation
    • James H. Carpenter
    • B24 - GRINDING POLISHING
  • Information Patent Grant

    Sand lump grinder
    • Patent number 3,982,702
    • Issue date Sep 28, 1976
    • The Carborundum Company
    • Donald M. Barnhart
    • B22 - CASTING POWDER METALLURGY