3709307

Information

• Patent Grant
• 3709307

• References
• Source

• Patent Number

  3,709,307

• Date Filed

  Not available

• Date Issued

  Tuesday, January 9, 1973
  52 years ago

• CPC

  • E21B15/02 - specially adapted for underwater drilling
  • E21B7/12 - Underwater drilling
  • E21B7/132 - from underwater buoyant support
  • E21B19/08 - Apparatus for feeding the rods or cables Apparatus for increasing or decreasing the pressure on the drilling tool Apparatus for counterbalancing the weight of the rods
  • E21B43/01 - specially adapted for obtaining from underwater installations
  • E21B43/017 - Production satellite stations

• US Classifications

  • 175 - Boring or penetrating the earth
  • 114 - Ships