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Katsumi Koyama

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Patents Grantslast 30 patents

  • Information Patent Grant

    Switching valve
    • Patent number 7,117,895
    • Issue date Oct 10, 2006
    • TGK Co., Ltd.
    • Katsumi Koyama
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Grant

    Three-way valve
    • Patent number 7,117,889
    • Issue date Oct 10, 2006
    • TGK Co., Ltd.
    • Katsumi Koyama
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Four-way switching valve
    • Patent number 7,069,949
    • Issue date Jul 4, 2006
    • TGK Co., Ltd.
    • Katsumi Koyama
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Grant

    Switching valve
    • Patent number 7,028,713
    • Issue date Apr 18, 2006
    • TGK Co., Ltd.
    • Katsumi Koyama
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Grant

    Three-way switching valve
    • Patent number 6,883,545
    • Issue date Apr 26, 2005
    • TGK Co., Ltd.
    • Katsumi Koyama
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Four-way switching valve
    • Patent number 6,860,294
    • Issue date Mar 1, 2005
    • TGK Co., Ltd.
    • Hisatoshi Hirota
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Grant

    Four-way switching valve
    • Patent number 6,823,897
    • Issue date Nov 30, 2004
    • TGK Co., Ltd.
    • Hisatoshi Hirota
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Grant

    Four-way switching valve
    • Patent number 6,810,911
    • Issue date Nov 2, 2004
    • TGK Co., Inc.
    • Hisatoshi Hirota
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Grant

    Proportional solenoid valve
    • Patent number 6,783,110
    • Issue date Aug 31, 2004
    • TGK Co., Ltd.
    • Hisatoshi Hirota
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Grant

    Degree of supercooling control type expansion valve
    • Patent number 6,532,764
    • Issue date Mar 18, 2003
    • TGK Co., Ltd.
    • Hisatoshi Hirota
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Grant

    Solenoid operated pilot valve
    • Patent number 6,390,441
    • Issue date May 21, 2002
    • TGK Co., Ltd.
    • Katsumi Koyama
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Four-way directional control valve
    • Patent number 6,152,178
    • Issue date Nov 28, 2000
    • TGK Co. Ltd.
    • Hisatoshi Hirota
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...

Patents Applicationslast 30 patents

  • Information Patent Application

    Switching valve
    • Publication number 20060124185
    • Publication date Jun 15, 2006
    • TGK CO., LTD.
    • Katsumi Koyama
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Application

    Control valve for variable displacement compressor
    • Publication number 20060086918
    • Publication date Apr 27, 2006
    • TGK CO., LTD.
    • Katsumi Koyama
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Application

    Control valve for variable displacement compressor
    • Publication number 20060083625
    • Publication date Apr 20, 2006
    • TGK CO., LTD.
    • Katsumi Koyama
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Application

    Expansion device
    • Publication number 20050050916
    • Publication date Mar 10, 2005
    • TGK CO., LTD.
    • Hisatoshi Hirota
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Application

    Three-way valve
    • Publication number 20040244845
    • Publication date Dec 9, 2004
    • TGK CO., LTD.
    • Katsumi Koyama
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Application

    Four-way switching valve
    • Publication number 20040226618
    • Publication date Nov 18, 2004
    • TGK CO., LTD.
    • Katsumi Koyama
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Application

    Switching valve
    • Publication number 20040134548
    • Publication date Jul 15, 2004
    • TGK CO., LTD.
    • Katsumi Koyama
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Application

    Three-way switching value
    • Publication number 20030230347
    • Publication date Dec 18, 2003
    • TGK CO., LTD.
    • Katsumi Koyama
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Application

    Four-way switching valve
    • Publication number 20030159739
    • Publication date Aug 28, 2003
    • Hisatoshi Hirota
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Application

    Four-way switching valve
    • Publication number 20030155020
    • Publication date Aug 21, 2003
    • Hisatoshi Hirota
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Application

    Proportional solenoid valve
    • Publication number 20030146402
    • Publication date Aug 7, 2003
    • TGK Co., Ltd.
    • Hisatoshi Hirota
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Application

    Four-way switching valve
    • Publication number 20030000586
    • Publication date Jan 2, 2003
    • TGK Co., Ltd.
    • Hisatoshi Hirota
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Application

    Solenoid operated pilot valve
    • Publication number 20020003221
    • Publication date Jan 10, 2002
    • Katsumi Koyama
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...