TREA

Charles J. Sperr Jr.

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  • Scottsdale, AZ, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Evaporative cooler
    • Patent number 4,851,162
    • Issue date Jul 25, 1989
    • Charles J. Sperr
    • F24 - HEATING RANGES VENTILATING
  • Information Patent Grant

    Evaporative cooler
    • Patent number 4,752,419
    • Issue date Jun 21, 1988
    • Charles J. Sperr
    • F24 - HEATING RANGES VENTILATING
  • Information Patent Grant

    Evaporative cooling
    • Patent number 4,576,013
    • Issue date Mar 18, 1986
    • Sperr; Charles J.
    • Charles J. Sperr
    • F24 - HEATING RANGES VENTILATING
  • Information Patent Grant

    Evaporative cooler
    • Patent number 4,379,712
    • Issue date Apr 12, 1983
    • Charles J. Sperr
    • F24 - HEATING RANGES VENTILATING