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Wai M. Choi

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  • W. Newton, MA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Hydrophobic polyethylene membrane for use in venting, degassing, an...
    • Patent number 11,103,833
    • Issue date Aug 31, 2021
    • Entegris, Inc.
    • Wai Ming Choi
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Grant

    Organic solvent purifier and method of using
    • Patent number 10,150,087
    • Issue date Dec 11, 2018
    • Entegris, Inc.
    • Saksatha Ly
    • C07 - ORGANIC CHEMISTRY
  • Information Patent Grant

    Porous composite membrane
    • Patent number 9,457,322
    • Issue date Oct 4, 2016
    • Entegris, Inc.
    • Wai-Ming Choi
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Grant

    Filter media with improved conductivity
    • Patent number 9,192,942
    • Issue date Nov 24, 2015
    • Hollingsworth & Vose Company
    • Wai Ming Choi
    • B03 - SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES O...
  • Information Patent Grant

    Filter media with improved conductivity
    • Patent number 8,663,358
    • Issue date Mar 4, 2014
    • Hollingsworth & Vose Company
    • Wai M. Choi
    • B03 - SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES O...
  • Information Patent Grant

    Filter media with improved conductivity
    • Patent number 7,964,012
    • Issue date Jun 21, 2011
    • Hollingsworth & Vose Company
    • Wai M. Choi
    • B03 - SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES O...
  • Information Patent Grant

    Gel-forming battery separator
    • Patent number 7,097,939
    • Issue date Aug 29, 2006
    • Hollingsworth & Vose Company
    • Anthony L. Ferreira
    • Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
  • Information Patent Grant

    Graft polymerization, separators, and batteries including the separ...
    • Patent number 6,955,865
    • Issue date Oct 18, 2005
    • Hollingsworth & Vose Company
    • Wai Ming Choi
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    Vapor deposition treated electret filter media
    • Patent number 6,802,315
    • Issue date Oct 12, 2004
    • Hollingsorth & Vose Company
    • Richard E. Gahan
    • Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Information Patent Grant

    Battery separator
    • Patent number 6,680,144
    • Issue date Jan 20, 2004
    • KVG Technologies, Inc.
    • Wai M. Choi
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    Graft polymerization, separators, and batteries including the separ...
    • Patent number 6,384,100
    • Issue date May 7, 2002
    • Hollingsworth + Vose Company
    • Wai Ming Choi
    • D04 - BRAIDING LACE-MAKING KNITTING TRIMMINGS NON-WOVEN FABRICS
  • Information Patent Grant

    Battery separator with sodium sulfate
    • Patent number 5,618,642
    • Issue date Apr 8, 1997
    • Daramic, Inc.
    • Abbas Samii
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Composite gauntlet/separator
    • Patent number 5,478,677
    • Issue date Dec 26, 1995
    • Daramic, Inc.
    • Wai M. Choi
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Oxidation resistant enveloped separator
    • Patent number 5,384,211
    • Issue date Jan 24, 1995
    • W. R. Grace & Co.-Conn.
    • Wai M. Choi
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Deep cycle battery separators
    • Patent number 5,154,988
    • Issue date Oct 13, 1992
    • W. R. Grace & Co.-Conn.
    • Wai M. Choi
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Battery separator
    • Patent number 4,734,344
    • Issue date Mar 29, 1988
    • W. R. Grace & Co.
    • Wai M. Choi
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Battery separator
    • Patent number 4,699,857
    • Issue date Oct 13, 1987
    • W. R. Grace & Co.
    • Richard T. Giovannoni
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    Battery separator
    • Patent number 4,369,236
    • Issue date Jan 18, 1983
    • W. R. Grace & Co.
    • Dennis D. O'Rell
    • H01 - BASIC ELECTRIC ELEMENTS

Patents Applicationslast 30 patents