TREA

John Hamrin

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  • Bloomington, MN, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Mufflers for use with engine retarders; and methods
    • Patent number 6,354,398
    • Issue date Mar 12, 2002
    • Donaldson Company, Inc.
    • Theodore G. Angelo
    • F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
  • Information Patent Grant

    Muffler arrangements and methods
    • Patent number 6,334,506
    • Issue date Jan 1, 2002
    • Donaldson Company, Inc.
    • John E. Hamrin
    • F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
  • Information Patent Grant

    Mufflers for use with engine retarders; and methods
    • Patent number 6,082,487
    • Issue date Jul 4, 2000
    • Donaldson Company, Inc.
    • Theodore G. Angelo
    • F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES