3821984

Information

• Patent Grant
• 3821984

• References
• Source

• Patent Number

  3,821,984

• Date Filed

  Not available

• Date Issued

  Tuesday, July 2, 1974
  50 years ago

• CPC

  • E21B34/02 - in well heads
  • E21B33/047 - for plural tubing strings
  • F16K31/143 - the fluid acting on a piston
  • F16K31/1635 - for rotating valves
  • E21B2034/002 - Ball valves
  • Y10T137/6038 - Particular valve seat or interface seal
  • Y10T137/6099 - Gear type

• US Classifications

  • 166 - Wells
  • 137 - Fluid handling
  • 251 - Valves and valve actuation