3918520

Information

• Patent Grant
• 3918520

• References
• Source

• Patent Number

  3,918,520

• Date Filed

  Not available

• Date Issued

  Tuesday, November 11, 1975
  49 years ago

• CPC

  • E21B47/0915 - using impression packers
  • E21B33/127 - with inflatable sleeve

• US Classifications

  • 166 - Wells