3645334

Information

• Patent Grant
• 3645334

• References
• Source

• Patent Number

  3,645,334

• Date Filed

  Not available

• Date Issued

  Tuesday, February 29, 1972
  52 years ago

• CPC

  • E21B33/12955 - using drag blocks frictionally engaging the inner wall of the well
  • E21B33/1294 - characterised by a valve

• US Classifications

  • 166 - Wells