Plural Patents (Class 33/748)
Only three (Class 33/749)
  • Depth measuring device with wear resistant guide means
    Patent number: 5155922
    Abstract: A cable length measuring device, comprises guide rollers for maintaining the cable in a straight line along a given segment of a line, and two encoding wheels disposed tangentially to the straight segment cable; additional guides, the ends of which bearing against the cable are made of a wear resistant material, are provided between the guide rollers and the tangential wheel/cable contact area.
    Type: Grant
    Filed: October 9, 1990
    Date of Patent: October 20, 1992
    Assignee: Schlumberger Technology Corporation
    Inventor: Neal S. Cooper