Patents by Inventor Liu Qiang

Liu Qiang 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).

  • Oil field pump unit hybrid gear reducer
    Patent number: 8863602
    Abstract: An oilfield pumping unit two-stage transmission gear reducer includes a low speed stage having a low speed shaft configured to receive motion from an intermediate shaft. A first gear pair includes a low speed shaft double circular arc gear mounted on the low speed shaft and configured to be driven by an intermediate shaft double circular arc gear mounted on the intermediate shaft. A high speed stage includes a high speed shaft configured to receive motion from an intermediate shaft. A second gear pair has a high speed shaft involute gear mounted on the high-speed shaft and configured to be driving an intermediate shaft involute gear mounted on the intermediate shaft.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: October 21, 2014
    Inventors: Weidong Gao, Liu Qiang
  • Oil field pump unit hybrid gear reducer
    Patent number: 8844397
    Abstract: An oilfield pumping unit two-stage transmission gear reducer includes a low speed stage having a low speed shaft configured to receive motion from an intermediate shaft. A first gear pair includes a low speed shaft double circular arc gear mounted on the low speed shaft and configured to be driven by an intermediate shaft double circular arc gear mounted on the intermediate shaft. A high speed stage includes a high speed shaft configured to receive motion from an intermediate shaft. A second gear pair has a high speed shaft involute gear mounted on the high-speed shaft and configured to be driving an intermediate shaft involute gear mounted on the intermediate shaft.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: September 30, 2014
    Inventors: Weidong Gao, Liu Qiang
  • Oil Field Pump Unit Hybrid Gear Reducer
    Publication number: 20140190297
    Abstract: An oilfield pumping unit two-stage transmission gear reducer includes a low speed stage having a low speed shaft configured to receive motion from an intermediate shaft. A first gear pair includes a low speed shaft double circular arc gear mounted on the low speed shaft and configured to be driven by an intermediate shaft double circular arc gear mounted on the intermediate shaft. A high speed stage includes a high speed shaft configured to receive motion from an intermediate shaft. A second gear pair has a high speed shaft involute gear mounted on the high-speed shaft and configured to be driving an intermediate shaft involute gear mounted on the intermediate shaft.
    Type: Application
    Filed: January 9, 2013
    Publication date: July 10, 2014
    Inventors: Wei Dong Gao, Liu Qiang
  • Oil Field Pump Unit Hybrid Gear Reducer
    Publication number: 20140190295
    Abstract: An oilfield pumping unit two-stage transmission gear reducer includes a low speed stage having a low speed shaft configured to receive motion from an intermediate shaft. A first gear pair includes a low speed shaft double circular arc gear mounted on the low speed shaft and configured to be driven by an intermediate shaft double circular arc gear mounted on the intermediate shaft. A high speed stage includes a high speed shaft configured to receive motion from an intermediate shaft. A second gear pair has a high speed shaft involute gear mounted on the high-speed shaft and configured to be driving an intermediate shaft involute gear mounted on the intermediate shaft.
    Type: Application
    Filed: March 7, 2013
    Publication date: July 10, 2014
    Inventors: Weidong Gao, Liu Qiang
  • METHOD AND SYSTEM FOR ESTIMATING A TRAILER POSITION OF A TRAILER ASSOCIATED WITH A VEHICLE
    Publication number: 20140005918
    Abstract: A data processor determines a position solution or selects a position solution from a first position solution and a second position solution based on a comparison between the turning radius at a hitch point, Rp, and the tongue length, where Rp=Vp/(?????), where Vp is a velocity at the hitch point, ?? is the vehicle yaw rate, and ?? is the change in a vehicle slip angle. A trailer position of a trailer is estimated in accordance with a position solution (e.g., determined or selected position solution) based on the determined vehicle heading, the hitch length, and the tongue length.
    Type: Application
    Filed: June 29, 2012
    Publication date: January 2, 2014
    Inventor: Liu Qiang
  • Authentication Method and Apparatus
    Publication number: 20120079576
    Abstract: An identity authentication method is provided.
    Type: Application
    Filed: September 28, 2010
    Publication date: March 29, 2012
    Inventors: Zhu Han, Liu Qiang, Huan Hao Zou