Patents by Inventor Keliang Zhou

Keliang Zhou 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).

  • Levelling rod, level determining apparatus for said rod, and level determining method
    Patent number: 7644505
    Abstract: The levelling rod (1) for a level determining apparatus (2) has position indications therealong along expressed by barcode symbols (11, 12). At least some of said barcode symbols are color barcode symbols, the color serving to encode said position indications. The barcode symbols can be organised in first and second blocks (12, 11) of barcode symbols, each providing a position indication, wherein the length (Ls) occupied along the rod (1) by a first block (12) is smaller than the length (Lb) occupied along the rod by a second block (11), the first blocks thereby providing a finer position indication than the second blocks. The first blocks (12) of barcode symbols can be formed of monochrome and color bar code symbols, e.g. just one color barcode symbol and at least one monochrome barcode symbol, while the second blocks (11) can be formed purely of color barcode symbols. The invention also relates to a level determining apparatus specifically adapted for the above rod, and to a method of using that rod.
    Type: Grant
    Filed: April 29, 2005
    Date of Patent: January 12, 2010
    Assignee: Leica Geosystems AG
    Inventors: Zheng Dong Zeng, Charles Leopold Elisabeth Dumoulin, Chin Keong Ng, Keliang Zhou
  • Levelling Rod, Level Determining Apparatus for Said Rod, and Level Determining Method
    Publication number: 20070289152
    Abstract: The levelling rod (1) for a level determining apparatus (2) has position indications therealong along expressed by barcode symbols (11, 12). At least some of said barcode symbols are colour barcode symbols, the colour serving to encode said position indications. The barcode symbols can be organized in first and second blocks (12, 11) of barcode symbols, each providing a position indication, wherein the length (Ls) occupied along the rod (1) by a first block (12) is smaller than the length (Lb) occupied along the rod by a second block (11), the first blocks thereby providing a finer position indication than the second blocks. The first blocks (12) of barcode symbols can be formed of monochrome and colour bar code symbols, e.g. just one colour barcode symbol and at least one monochrome barcode symbol, while the second blocks (11) can be formed purely of colour barcode symbols. The invention also relates to a level determining apparatus specifically adapted for the above rod, and to a method of using that rod.
    Type: Application
    Filed: April 29, 2005
    Publication date: December 20, 2007
    Applicant: LEICA GEOSYSTEMS AG
    Inventors: Zheng Zeng, Charles Dumoulin, Chin Ng, Keliang Zhou