3867985

Information

• Patent Grant
• 3867985

• References
• Source

• Patent Number

  3,867,985

• Date Filed

  Not available

• Date Issued

  Tuesday, February 25, 1975
  49 years ago

• CPC

  • E21B21/10 - Valve arrangements in drilling fluid circulation systems
  • E21B17/18 - Pipes provided with plural fluid passages
  • F16K17/24 - acting directly on the cutting-off member
  • Y10T137/7873 - Ball valves
  • Y10T137/791 - Ball valves

• US Classifications

  • 166 - Wells
  • 137 - Fluid handling
  • 175 - Boring or penetrating the earth