TREA

Donald B. Caldwell

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  • Lake Elmo, MN, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    High-temperature damping composite
    • Patent number 4,223,073
    • Issue date Sep 16, 1980
    • Minnesota Mining and Manufacturing Company
    • Donald B. Caldwell
    • G10 - MUSICAL INSTRUMENTS ACOUSTICS
  • Information Patent Grant

    Sound-damped saw blade
    • Patent number 4,034,639
    • Issue date Jul 12, 1977
    • Minnesota Mining and Manufacturing Company
    • Donald B. Caldwell
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Damping unit for globular storage tank
    • Patent number 3,986,581
    • Issue date Oct 19, 1976
    • Minnesota Mining and Manufacturing Company
    • Donald B. Caldwell
    • B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL