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Philip A. Lessard

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  • Boxborough, MA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Purge and rough cryopump regeneration process, cryopump and controller
    • Patent number 5,862,671
    • Issue date Jan 26, 1999
    • Helix Technology Corporation
    • Philip A. Lessard
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    High conductance water pump
    • Patent number 5,483,803
    • Issue date Jan 16, 1996
    • Helix Technology Corporation
    • Stephen R. Matte
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Cryopump with improved second stage passageway
    • Patent number 5,156,007
    • Issue date Oct 20, 1992
    • Helix Technology Corporation
    • Allen J. Bartlett
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Grant

    Cryogenic recondenser with remote cold box
    • Patent number RE33878
    • Issue date Apr 14, 1992
    • Helix Technology Corporation
    • Allen J. Bartlett
    • 062 - Refrigeration
  • Information Patent Grant

    Vacuum system with molecular flow line
    • Patent number 4,860,546
    • Issue date Aug 29, 1989
    • Helix Technology Corporation
    • John T. Harvell
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Cryogenic recondenser with remote cold box
    • Patent number 4,766,741
    • Issue date Aug 30, 1988
    • Helix Technology Corporation
    • Allen J. Bartlett
    • F17 - STORING OF DISTRIBUTING GASES OR LIQUIDS
  • Information Patent Grant

    Cryopump with quicker adsorption
    • Patent number 4,718,241
    • Issue date Jan 12, 1988
    • Helix Technology Corporation
    • Philip A. Lessard
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    High pressure stepped clearance seal valve in a cryogenic refrigera...
    • Patent number 4,708,165
    • Issue date Nov 24, 1987
    • Helix Technology Corporation
    • Philip A. Lessard
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Grant

    Temperature control of cryogenic systems
    • Patent number 4,679,401
    • Issue date Jul 14, 1987
    • Helix Technology Corporation
    • Philip A. Lessard
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Cryopump with improved adsorption capacity
    • Patent number 4,494,381
    • Issue date Jan 22, 1985
    • Helix Technology Corporation
    • Philip A. Lessard
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Fluid actuator for cryogenic valve
    • Patent number 4,466,251
    • Issue date Aug 21, 1984
    • Helix Technology Corporation
    • Fred F. Chellis
    • F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
  • Information Patent Grant

    Means for periodic desorption of a cryopump
    • Patent number 4,438,632
    • Issue date Mar 27, 1984
    • Helix Technology Corporation
    • Philip A. Lessard
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...