Patents by Inventor Andrew Phillip Churchill

Andrew Phillip Churchill 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).

  • Top filling tubing
    Patent number: 7975766
    Abstract: A method of top-filling a drill pipe string comprises injecting fluid into the upper end of the string. Apparatus for use in top-filling a drill pipe string comprises an injector adapted to co-operate with the upper end of a drill pipe string, whereby fluid may be pumped through the injector and into the string.
    Type: Grant
    Filed: June 11, 2007
    Date of Patent: July 12, 2011
    Assignee: Churchill Drilling Tools Limited
    Inventor: Andrew Phillip Churchill
  • Downhole tool
    Patent number: 7766084
    Abstract: A downhole tool (10) comprises a body (12) defining a bore. The body includes a valve arrangement (18) including flow ports (24) in the wall of the body. The ports may be opened or closed. In addition, a variable flow restriction (30) is provided in the bore (14), the degree of restriction tending to decrease as flow across the restriction increases. The variable flow restriction may be utilized to actuate the valve arrangement.
    Type: Grant
    Filed: November 17, 2004
    Date of Patent: August 3, 2010
    Assignee: Churchill Drilling Tools Limited
    Inventor: Andrew Phillip Churchill
  • TOP FILLING TUBING
    Publication number: 20100012324
    Abstract: A method of top-filling a drill pipe string comprises injecting fluid into the upper end of the string. Apparatus for use in top-filling a drill pipe string comprises an injector adapted to co-operate with the upper end of a drill pipe string, whereby fluid may be pumped through the injector and into the string.
    Type: Application
    Filed: June 11, 2007
    Publication date: January 21, 2010
    Inventor: Andrew Phillip Churchill