Patents by Inventor Wang Kuo Hua

Wang Kuo Hua has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Extending ladder and associated manufacturing methods
    Patent number: 7048094
    Abstract: Extending ladders and associated manufacturing methods are disclosed. A ladder in accordance with an exemplary embodiment of the present invention comprises a plurality of rung units, each rung unit including a left column, a right column, and a rung extending between the left column and the right column. The ladder may include a first column assembly including a first column and a ring coupled to the first column proximate a distal end thereof, and a second column assembly including a second column and a sleeve coupled to the second column proximate a proximal end thereof. The second column being at least partially disposed within a lumen defined by an internal surface of the first column. The sleeve includes an external guiding surface for contacting the internal surface of the first column and the ring includes an internal guiding surface for contacting an exterior surface of the second column.
    Type: Grant
    Filed: February 18, 2005
    Date of Patent: May 23, 2006
    Assignees: Core Distribution, Inc., Urban Sporting Goods
    Inventors: Mitchell I. Kieffer, Wang Kuo Hua, Craig S. Aizman
  • Extending ladder and associated manufacturing methods
    Patent number: 6883645
    Abstract: Extending ladders and associated manufacturing methods are disclosed. A ladder in accordance with an exemplary embodiment of the present invention comprises a plurality of rung units, each rung unit including a left column, a right column, and a rung extending between the left column and the right column. The ladder may include a first column assembly including a first column and a ring coupled to the first column proximate a distal end thereof, and a second column assembly including a second column and a sleeve coupled to the second column proximate a proximal end thereof. The second column being at least partially disposed within a lumen defined by an internal surface of the first column. The sleeve includes an external guiding surface for contacting the internal surface of the first column and the ring includes an internal guiding surface for contacting an exterior surface of the second column.
    Type: Grant
    Filed: January 17, 2004
    Date of Patent: April 26, 2005
    Assignees: Core Distribution, Inc., Urban Sporting Goods
    Inventors: Mitchell I. Kieffer, Wang Kuo Hua, Craig S. Aizman
  • Extending ladder and associated manufacturing methods
    Publication number: 20040144596
    Abstract: Extending ladders and associated manufacturing methods are disclosed. A ladder in accordance with an exemplary embodiment of the present invention comprises a plurality of rung units, each rung unit including a left column, a right column, and a rung extending between the left column and the right column. The ladder may include a first column assembly including a first column and a ring coupled to the first column proximate a distal end thereof, and a second column assembly including a second column and a sleeve coupled to the second column proximate a proximal end thereof. The second column being at least partially disposed within a lumen defined by an internal surface of the first column. The sleeve includes an external guiding surface for contacting the internal surface of the first column and the ring includes an internal guiding surface for contacting an exterior surface of the second column.
    Type: Application
    Filed: January 17, 2004
    Publication date: July 29, 2004
    Inventors: Mitchell I. Kieffer, Wang Kuo Hua, Craig S. Aizman
  • Extending ladder and associated manufacturing methods
    Patent number: 6708800
    Abstract: Extending ladders and associated manufacturing methods are disclosed. A ladder in accordance with an exemplary embodiment of the present invention comprises a plurality of rung units, each rung unit including a left column, a right column, and a rung extending between the left column and the right column. The ladder may include a first column assembly including a first column and a ring coupled to the first column proximate a distal end thereof, and a second column assembly including a second column and a sleeve coupled to the second column proximate a proximal end thereof. The second column being at least partially disposed within a lumen defined by an internal surface of the first column. The sleeve includes an external guiding surface for contacting the internal surface of the first column and the ring includes an internal guiding surface for contacting an exterior surface of the second column.
    Type: Grant
    Filed: August 2, 2002
    Date of Patent: March 23, 2004
    Assignees: Core Distribution, Inc., Urban Sporting Goods
    Inventors: Mitchell I. Kieffer, Wang Kuo Hua, Craig S. Aizman
  • Extending ladder and associated manufacturing methods
    Publication number: 20040020718
    Abstract: Extending ladders and associated manufacturing methods are disclosed. A ladder in accordance with an exemplary embodiment of the present invention comprises a plurality of rung units, each rung unit including a left column, a right column, and a rung extending between the left column and the right column. The ladder may include a first column assembly including a first column and a ring coupled to the first column proximate a distal end thereof, and a second column assembly including a second column and a sleeve coupled to the second column proximate a proximal end thereof. The second column being at least partially disposed within a lumen defined by an internal surface of the first column. The sleeve includes an external guiding surface for contacting the internal surface of the first column and the ring includes an internal guiding surface for contacting an exterior surface of the second column.
    Type: Application
    Filed: August 2, 2002
    Publication date: February 5, 2004
    Inventors: Mitchell I. Kieffer, Wang Kuo Hua, Craig S. Aizman