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Donald J. Schwalm

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  • Northville, MI, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Method of controlling furnace atmospheres
    • Patent number 4,445,945
    • Issue date May 1, 1984
    • Holcroft & Company
    • Donald J. Schwalm
    • C21 - METALLURGY OF IRON
  • Information Patent Grant

    Carburizing furnace
    • Patent number 4,093,195
    • Issue date Jun 6, 1978
    • Holcroft & Company
    • Donald J. Schwalm
    • C21 - METALLURGY OF IRON