Patents by Inventor Nai Chang Liu

Nai Chang Liu 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).

  • Instrument mounting system with dual encoders
    Patent number: 7228253
    Abstract: The present invention provides a way to measure the position of an instrument that is mounted on an instrument shaft within a clutched mounting system, the instrument shaft being driven through a reduction gearbox by a motor shaft. The position of the instrument is measured as a function of the position of the motor shaft and the position of the instrument shaft, the measurement of the position of the motor shaft providing greater precision than the position of the instrument shaft. Because the mounting system is clutched, it is necessary to check at intervals whether the measurement of the motor shaft position no longer accurately represents the position of the instrument, in which case the measurement of the motor shaft position is resynchronized to the measurement of the instrument shaft.
    Type: Grant
    Filed: August 19, 2004
    Date of Patent: June 5, 2007
    Assignee: Pacific Telescope Corp.
    Inventors: Jack Chin Chuan Chen, Nai Chang Liu