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Raymond Wai Hang Chu

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Patents Grantslast 30 patents

  • Information Patent Grant

    Electrical switch
    • Patent number 6,784,390
    • Issue date Aug 31, 2004
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Electrical switch assembly
    • Patent number 6,774,509
    • Issue date Aug 10, 2004
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Power supply module for electrical power tools
    • Patent number 6,765,317
    • Issue date Jul 20, 2004
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Toroidal core for a toroid
    • Patent number 6,762,666
    • Issue date Jul 13, 2004
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Electrical switch
    • Patent number 6,759,608
    • Issue date Jul 6, 2004
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Power tool trigger control
    • Patent number 6,741,051
    • Issue date May 25, 2004
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Circuit breaker
    • Patent number 6,624,991
    • Issue date Sep 23, 2003
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Electrical switch
    • Patent number 6,605,787
    • Issue date Aug 12, 2003
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Electrical switch including a metal heat sink
    • Patent number 6,483,063
    • Issue date Nov 19, 2002
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Motor current sensing in electric power tools
    • Patent number 6,388,408
    • Issue date May 14, 2002
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Power plug with circuit breaker
    • Patent number 6,340,926
    • Issue date Jan 22, 2002
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Electrical switch
    • Patent number 6,281,482
    • Issue date Aug 28, 2001
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • A45 - HAND OR TRAVELLING ARTICLES
  • Information Patent Grant

    On-off switch with off position locking actuator
    • Patent number 6,274,828
    • Issue date Aug 14, 2001
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Electrical rocker switch
    • Patent number 6,130,393
    • Issue date Oct 10, 2000
    • Defond Manufacturing Ltd.
    • Raymond Wai Hang Chu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Electrical switch
    • Patent number 6,118,085
    • Issue date Sep 12, 2000
    • Defond Manufacturing Ltd.
    • Raymond Wai Hang Chu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Circuit breaker
    • Patent number 5,815,363
    • Issue date Sep 29, 1998
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
  • Information Patent Grant

    Electrical switch
    • Patent number 5,810,109
    • Issue date Sep 22, 1998
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • H01 - BASIC ELECTRIC ELEMENTS

Patents Applicationslast 30 patents

  • Information Patent Application

    Method and apparatus for electromechanically interrupting and recon...
    • Publication number 20060044085
    • Publication date Mar 2, 2006
    • Defond Components Limited
    • Raymond Wai Hang Chu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Application

    Arc fault circuit interrupter
    • Publication number 20050254187
    • Publication date Nov 17, 2005
    • Defond Components Limited
    • Raymond Chu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Application

    Power tool trigger control
    • Publication number 20040041531
    • Publication date Mar 4, 2004
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Information Patent Application

    Electrical switch
    • Publication number 20040040827
    • Publication date Mar 4, 2004
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Application

    Electrical switch
    • Publication number 20040020752
    • Publication date Feb 5, 2004
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Application

    Toroidal core for a toroid
    • Publication number 20030210123
    • Publication date Nov 13, 2003
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Application

    Power supply module for electrical power tools
    • Publication number 20030184161
    • Publication date Oct 2, 2003
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Information Patent Application

    Electrical switch assembly
    • Publication number 20030141765
    • Publication date Jul 31, 2003
    • Defond Manufacturing Limited
    • Raymond Wai Hang Chu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Application

    Electrical switch
    • Publication number 20020130027
    • Publication date Sep 19, 2002
    • Raymond Wai Hang Chu
    • H01 - BASIC ELECTRIC ELEMENTS