TREA

John A. Helmsderfer

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  • Cincinnati, OH, US
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Patents Grantslast 30 patents

  • Information Patent Grant

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    • Patent number D435893
    • Issue date Jan 2, 2001
    • Truebro, Inc.
    • John A. Helmsderfer
    • D23 - Environmental heating and cooling
  • Information Patent Grant

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    • Patent number D431288
    • Issue date Sep 26, 2000
    • Truebro, Inc.
    • John A. Helmsderfer
    • D23 - Environmental heating and cooling