TREA

Steven E. Williams

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  • St. Louis, MO, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Four way valve
    • Patent number 4,340,202
    • Issue date Jul 20, 1982
    • Emerson Electric Co.
    • David P. Hargraves
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Grant

    Electrically operated valve with balanced port design
    • Patent number 4,239,177
    • Issue date Dec 16, 1980
    • Emerson Electric Co.
    • Steven E. Williams
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Grant

    Four way valve
    • Patent number 4,202,373
    • Issue date May 13, 1980
    • Emerson Electric Co.
    • David P. Hargraves
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...