TREA

Keystone International Holdings Corp.

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  • Wilmington, DE, US
Organizations

Patents Grantslast 30 patents

  • Information Patent Grant

    Automatic recirculation valve
    • Patent number 5,549,131
    • Issue date Aug 27, 1996
    • Keystone International Holdings Corp.
    • Horace J. Maxwell
    • G05 - CONTROLLING REGULATING
  • Information Patent Grant

    Steam conditioning butterfly valve
    • Patent number 5,439,619
    • Issue date Aug 8, 1995
    • Keystone International Holdings Corp.
    • Max Kuffer
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Steam desuperheater
    • Patent number 5,385,121
    • Issue date Jan 31, 1995
    • Keystone International Holdings Corp.
    • Roy L. Feiss
    • F22 - STEAM GENERATION
  • Information Patent Grant

    Automatic recirculation valve
    • Patent number 5,333,638
    • Issue date Aug 2, 1994
    • Keystone International Holdings Corp.
    • Horace J. Maxwell
    • G05 - CONTROLLING REGULATING
  • Information Patent Grant

    Method and apparatus for monitoring and analyzing recirculation con...
    • Patent number 5,261,437
    • Issue date Nov 16, 1993
    • Keystone International Holdings Corp.
    • David A. Kalix
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Recirculation valve
    • Patent number 5,172,716
    • Issue date Dec 22, 1992
    • Keystone International Holdings Corp.
    • George J. Paptzun
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Pressure reducing and conditioning valves
    • Patent number 5,012,841
    • Issue date May 7, 1991
    • Keystone International Holdings Corp.
    • Max Kueffer
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Conditioning valve
    • Patent number 5,005,605
    • Issue date Apr 9, 1991
    • Keystone International Holdings Corp.
    • Max Kueffer
    • F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
  • Information Patent Grant

    Turbine filter with pressure seal bonnet
    • Patent number 5,000,851
    • Issue date Mar 19, 1991
    • Keystone International Holdings Corp.
    • Max Kueffer
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Grant

    Recirculation valve with pilot valve
    • Patent number 4,967,783
    • Issue date Nov 6, 1990
    • Keystone International Holdings Corp.
    • George Loos
    • G05 - CONTROLLING REGULATING
  • Information Patent Grant

    Low pressure recirculation valve
    • Patent number 4,941,502
    • Issue date Jul 17, 1990
    • Keystone International Holdings Corp.
    • George Loos
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Automatic recirculation valve
    • Patent number 4,779,639
    • Issue date Oct 25, 1988
    • Keystone International Holdings Corp.
    • George J. Loos
    • G05 - CONTROLLING REGULATING