3221820

Information

• Patent Grant
• 3221820

• References
• Source

• Patent Number

  3,221,820

• Date Filed

  Not available

• Date Issued

  Tuesday, December 7, 1965
  59 years ago

• CPC

  • E21B49/087 - Well testing
  • E21B34/12 - operated by movement of casings or tubings
  • Y10T74/2063 - Stops
  • Y10T74/20924 - Controller checks

• US Classifications

  • 166 - Wells
  • 074 - Machine element or mechanism
  • 251 - Valves and valve actuation