Patents by Inventor Svein Stubstad

Svein Stubstad 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 drives with shaft multi-seal
    Patent number: 7748473
    Abstract: A top drive system for wellbore operations, the top drive system including motor apparatus, a main shaft driven by the motor apparatus, the main shaft having a top end and a bottom end, a quill connected to the main shaft, a gear system interconnected with the quill and the motor apparatus, and a multi-seal system for sealing against the quill. This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 C.F.R. 1.72(b).
    Type: Grant
    Filed: July 11, 2008
    Date of Patent: July 6, 2010
    Assignee: National Oilwell Varco, L.P.
    Inventors: Lawrence E. Wells, Preston Fox, Cliff Swiontek, Svein Stubstad, Howard L. Ervin, James D. Brugman, Paul Conover
  • Top drives with shaft multi-seal
    Publication number: 20090044982
    Abstract: A top drive system for wellbore operations, the top drive system including motor apparatus, a main shaft driven by the motor apparatus, the main shaft having a top end and a bottom end, a quill connected to the main shaft, a gear system interconnected with the quill and the motor apparatus, and a multi-seal system for sealing against the quill. This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 C.F.R. 1.72(b).
    Type: Application
    Filed: July 11, 2008
    Publication date: February 19, 2009
    Inventors: Lawrence E. Wells, Preston Fox, Cliff Swiontek, Svein Stubstad, Howard L. Ervin, James D. Brugman, Paul Conover
  • Multi-seal for top drive shaft
    Patent number: 7487848
    Abstract: A multi-seal sealing assembly with multiple seals so that when one seal wears out another can be moved into sealing position; and a top drive system for wellbore operations with such a sealing assembly; the sealing assembly in one aspect having a seal carrier movable to move at least one secondary seal into sealing position when a primary seal has worn out.
    Type: Grant
    Filed: April 28, 2006
    Date of Patent: February 10, 2009
    Assignee: Varco I/P, Inc.
    Inventors: Larry Wells, Svein Stubstad, Howard Ervin, James D. Brugman, Paul Conover
  • Top drive washpipe system
    Publication number: 20080230274
    Abstract: A top drive system for wellbore operations, the top drive system, in at least certain aspects, including a motor, a main shaft driven by the motor, the main shaft having a top end and a bottom end, a speed reduction system interconnected with the main shaft, a washpipe shaft interconnected with the speed reduction system for driving the washpipe shaft at a speed of rotation less than a speed of rotation of the main shaft. This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 C.P.R. 1.72(b).
    Type: Application
    Filed: February 4, 2008
    Publication date: September 25, 2008
    Inventor: Svein Stubstad
  • Top drive systems
    Patent number: 7401664
    Abstract: A top drive system for wellbore operations, the top drive system including motor apparatus, a main shaft driven by the motor apparatus, the main shaft having a top end and a bottom end, a quill connected to the main shaft, and a gear system interconnected with the quill and the motor apparatus.
    Type: Grant
    Filed: April 28, 2006
    Date of Patent: July 22, 2008
    Assignee: Varco I/P
    Inventors: Lawrence E. Wells, Preston Fox, Cliff Swiontek, Svein Stubstad
  • Multi-seal for top drive shaft
    Publication number: 20070251705
    Abstract: A multi-seal sealing assembly with multiple seals so that when one seal wears out another can be moved into sealing position; and a top drive system for wellbore operations with such a sealing assembly; the sealing assembly in one aspect having a seal carrier movable to move at least one secondary seal into sealing position when a primary seal has worn out.
    Type: Application
    Filed: April 28, 2006
    Publication date: November 1, 2007
    Inventors: Lawrence Wells, Svein Stubstad, Howard Ervin, James Brugman, Paul Conover
  • Top drive systems
    Publication number: 20070251699
    Abstract: A top drive system for wellbore operations, the top drive system including motor apparatus, a main shaft driven by the motor apparatus, the main shaft having a top end and a bottom end, a quill connected to the main shaft, and a gear system interconnected with the quill and the motor apparatus.
    Type: Application
    Filed: April 28, 2006
    Publication date: November 1, 2007
    Inventors: Lawrence Wells, Preston Fox, Cliff Swiontek, Svein Stubstad