Patents by Inventor Thomas W. Bakker

Thomas W. Bakker 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 device for moving a tube in a borehole in the ground
    Patent number: 6796390
    Abstract: A tube (1) in a borehole (2) in the ground (3) is displaced. The tube is simultaneously displaced along and about its axis, such that it is axially introduced into or retracted from the borehole. According to the invention, displacing the composed tube about its axis comprises an oscillating movement. The invention further relates to a device for displacing a tube in a borehole.
    Type: Grant
    Filed: July 18, 2002
    Date of Patent: September 28, 2004
    Assignee: Shell Oil Company
    Inventor: Thomas W. Bakker