Patents by Inventor Robert Cai

Robert Cai 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).

  • Method and apparatus for erecting a drilling rig
    Patent number: 9650840
    Abstract: A method for erecting a drilling rig and an apparatus therefor having a mast, a base, a floor support, legs arranged between the base and the floor support, a primary lifting ram in engagement with the mast, and a floor support lifting ram, is disclosed. The method involves raising the mast with the primary lifting ram, raising the floor support with the floor support lifting ram to an intermediate height, engaging the primary lifting ram with the floor support and raising the floor support from the intermediate height to full working height with the mast lifting ram.
    Type: Grant
    Filed: April 27, 2015
    Date of Patent: May 16, 2017
    Assignee: NATIONAL OILWELL VARCO, L.P.
    Inventors: Rui Cheng, Robert Cai
  • METHOD AND APPARATUS FOR ERECTING A DRILLING RIG
    Publication number: 20160312543
    Abstract: A method for erecting a drilling rig and an apparatus therefor having a mast, a base, a floor support, legs arranged between the base and the floor support, a primary lifting ram in engagement with the mast, and a floor support lifting ram, is disclosed. The method involves raising the mast with the primary lifting ram, raising the floor support with the floor support lifting ram to an intermediate height, engaging the primary lifting ram with the floor support and raising the floor support from the intermediate height to full working height with the mast lifting ram.
    Type: Application
    Filed: April 27, 2015
    Publication date: October 27, 2016
    Inventors: Rui Cheng, Robert Cai