Patents by Inventor Loren Boisvert

Loren Boisvert 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).

  • Drill string shutoff valve
    Patent number: 6918452
    Abstract: A valve assembly connects into a drill string for opening and closing the inner passage within the drill string. The valve member moves between the open and closed positions in response to axial movement of the drill string. The valve member has an upper portion and a lower portion. A valve member and valve sleeve are located within an inner passage. Lifting the drill string causes the upper portion to move upward relative to the lower portion, bringing along with it the valve member, while the valve sleeve remains stationary with the lower portion, opening the valve.
    Type: Grant
    Filed: December 17, 2002
    Date of Patent: July 19, 2005
    Assignee: Vetco Gray Inc.
    Inventors: Kwong-Onn C. Chan, Behrooz Movaffagh, Loren Boisvert
  • Drill string shutoff valve
    Publication number: 20040112641
    Abstract: A valve assembly connects into a drill string for opening and closing the inner passage within the drill string. The valve member moves between the open and closed positions in response to axial movement of the drill string. The valve member has an upper portion and a lower portion. A valve member and valve sleeve are located within an inner passage. Lifting the drill string causes the upper portion to move upward relative to the lower portion, bringing along with it the valve member, while the valve sleeve remains stationary with the lower portion, opening the valve.
    Type: Application
    Filed: December 17, 2002
    Publication date: June 17, 2004
    Inventors: Kwong-Onn C. Chan, Behrooz Movaffagh, Loren Boisvert