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David P. Hargraves

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  • Wester Groves, MO, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Pulse controlled expansion valve for multiple evaporators and metho...
    • Patent number RE33775
    • Issue date Dec 24, 1991
    • Emerson Electric Co.
    • Joseph L. Behr
    • 062 - Refrigeration
  • Information Patent Grant

    Apparatus for and method of automatically adjusting the superheat s...
    • Patent number 4,467,613
    • Issue date Aug 28, 1984
    • Emerson Electric Co.
    • Joseph L. Behr
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Grant

    Pulse controlled expansion valve and method
    • Patent number 4,459,819
    • Issue date Jul 17, 1984
    • Emerson Electric Co.
    • David P. Hargraves
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • 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

    Modulating diaphragm valve
    • Patent number 4,268,006
    • Issue date May 19, 1981
    • Emerson Electric Co.
    • Bernard L. Kunz
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • 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...
  • Information Patent Grant

    Four-way valve
    • Patent number 3,985,154
    • Issue date Oct 12, 1976
    • Emerson Electric Co.
    • David P. Hargraves
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...