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Hartmut Kriehn

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  • K?ouml;ln, DE
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Patents Grantslast 30 patents

  • Information Patent Grant

    Tempering method for a screw-type vacuum pump
    • Patent number 7,232,295
    • Issue date Jun 19, 2007
    • Oerlikon Leybold Vacuum GmbH
    • Hartmut Kriehn
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Vacuum pump
    • Patent number 7,153,093
    • Issue date Dec 26, 2006
    • Leybold Vacuum GmbH
    • Thomas Dreifert
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Cooled screw-type vacuum pump
    • Patent number 7,056,108
    • Issue date Jun 6, 2006
    • Leybold Vakuum GmbH
    • Manfred Behling
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Two shaft vacuum pump with cantilevered rotors
    • Patent number 6,964,559
    • Issue date Nov 15, 2005
    • Leybold Vakuum GmbH
    • Manfred Behling
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Two-shaft vacuum pump
    • Patent number 6,863,511
    • Issue date Mar 8, 2005
    • Leybold Vakuum GmbH
    • Hartmut Kriehn
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Screw vacuum pump with a coolant circuit
    • Patent number 6,758,660
    • Issue date Jul 6, 2004
    • Leybold Vakuum GmbH
    • Hartmut Kriehn
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Process for operating a dry-compression vacuum pump as well as a su...
    • Patent number 5,975,857
    • Issue date Nov 2, 1999
    • Leybold Aktiengesellschaft
    • Monika Kuhn
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Apparatus and process for operating a dry-compression vacuum pump
    • Patent number 5,718,565
    • Issue date Feb 17, 1998
    • Leybold Aktiengesellschaft
    • Monika Kuhn
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Method of operating a claw-type vacuum pump and a claw-type vacuum...
    • Patent number 5,660,535
    • Issue date Aug 26, 1997
    • Leybold Aktiengesellschaft
    • Andreas Kobus
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Muffler
    • Patent number 5,399,817
    • Issue date Mar 21, 1995
    • Leybold AG
    • Hanns-Peter Berges
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Dry-running twin-shaft vacuum pump
    • Patent number 5,364,245
    • Issue date Nov 15, 1994
    • Leybold Aktiengesellschaft
    • Hartmut Kriehn
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Multi-stage vacuum pump with reaction chamber between stages
    • Patent number 5,131,825
    • Issue date Jul 21, 1992
    • Leybold Aktiengesellschaft
    • Paul Bachmann
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Twin-shaft, multiple-stage vacuum pump with the shafts vertically d...
    • Patent number 4,940,398
    • Issue date Jul 10, 1990
    • Leybold Aktiengesellschaft
    • Hanns-Peter Berges
    • F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES

Patents Applicationslast 30 patents

  • Information Patent Application

    Vacuum pump
    • Publication number 20050147517
    • Publication date Jul 7, 2005
    • Thomas Dreifert
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Application

    Cooled screw vacuum pump
    • Publication number 20050069446
    • Publication date Mar 31, 2005
    • Hartmut Kriehn
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Application

    Tempering method for a screw-type vacuum pump
    • Publication number 20050019169
    • Publication date Jan 27, 2005
    • Hartmut Kriehn
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Application

    Cooled screw-type vacuum pump
    • Publication number 20040265160
    • Publication date Dec 30, 2004
    • Manfred Behling
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Application

    Two-shaft vacuum pump
    • Publication number 20040091380
    • Publication date May 13, 2004
    • Hartmut Kriehn
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Application

    Vacuum pump with two co-operating rotors
    • Publication number 20030152468
    • Publication date Aug 14, 2003
    • Manfred Behling
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...