TREA

Donald Y. Shanfelt

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  • Lakewood, CO, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Inflatable solar energy collector
    • Patent number 4,182,307
    • Issue date Jan 8, 1980
    • Shanfelt; Donald
    • Dannie K. Brindle
    • F24 - HEATING RANGES VENTILATING
  • Information Patent Grant

    Inflatable solar heat collector
    • Patent number 4,160,443
    • Issue date Jul 10, 1979
    • Shanfelt; Donald Y.
    • Dannie K. Brindle
    • F24 - HEATING RANGES VENTILATING