2187871

Information

• Patent Grant
• 2187871

• References
• Source

• Patent Number

  2,187,871

• Date Filed

  Not available

• Date Issued

  Tuesday, January 23, 1940
  85 years ago

• CPC

  • E21B15/02 - specially adapted for underwater drilling
  • E21B7/132 - from underwater buoyant support
  • E21B17/012 - with buoyancy elements
  • E21B33/035 - specially adapted for underwater installations

• US Classifications

  • 175 - Boring or penetrating the earth
  • 166 - Wells
  • 405 - Hydraulic and earth engineering