Patents by Inventor Chad D. Evans

Chad D. Evans 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).

  • Patent number: 7448446
    Abstract: A downhole assembly comprises a whipstock and an expandable anchoring tool connected to the whipstock, wherein the tool comprises a body including a plurality of angled channels formed into a wall thereof and a plurality of moveable slips, wherein the slips translate along the angled channels between a collapsed position and an expanded position. A method for performing a thru tubing operation in a well bore comprises running a downhole assembly comprising a whipstock and an expandable anchoring tool in a collapsed position through a first diameter section of the well bore, orienting the whipstock, and translating a plurality of pairs of slips of the expandable anchoring tool to an expanded position into gripping engagement with a casing lining a second diameter section of the well bore that is larger than the first diameter section, wherein the pairs of slips are axially spaced apart along the expandable anchoring tool.
    Type: Grant
    Filed: February 2, 2007
    Date of Patent: November 11, 2008
    Assignee: Smith International, Inc.
    Inventors: John E. Campbell, Charles H. Dewey, Chad D. Evans
  • Patent number: 7178589
    Abstract: A downhole tool is disclosed that functions as an expandable anchoring tool, capable of passing through a restricted wellbore diameter while in a collapsed position and thereafter translating to an expanded position for grippingly engaging a larger wellbore diameter. An embodiment of the tool includes a body including a plurality of angled channels formed into a wall of the body and a plurality of moveable slips. The plurality of moveable slips translates along the plurality of angled channels between a collapsed position and an expanded position. The slips may include a plurality of extensions corresponding to and engaging the plurality of channels.
    Type: Grant
    Filed: November 21, 2003
    Date of Patent: February 20, 2007
    Assignee: Smith International, Inc.
    Inventors: John E. Campbell, Charles H. Dewey, Chad D. Evans
  • Publication number: 20040149430
    Abstract: A downhole tool is disclosed that functions as an expandable anchoring tool, capable of passing through a restricted wellbore diameter while in a collapsed position and thereafter translating to an expanded position for grippingly engaging a larger wellbore diameter. An embodiment of the tool includes a body including a plurality of angled channels formed into a wall of the body and a plurality of moveable slips. The plurality of moveable slips translates along the plurality of angled channels between a collapsed position and an expanded position. The slips may include includes a plurality of extensions corresponding to and engaging the plurality of channels.
    Type: Application
    Filed: November 21, 2003
    Publication date: August 5, 2004
    Inventors: John E. Campbell, Charles H. Dewey, Chad D. Evans