3646995

Information

• Patent Grant
• 3646995

• References
• Source

• Patent Number

  3,646,995

• Date Filed

  Not available

• Date Issued

  Tuesday, March 7, 1972
  52 years ago

• CPC

  • E21B49/001 - specially adapted for underwater installations
  • E21B33/1294 - characterised by a valve
  • E21B34/125 - with time delay systems
  • E21B49/081 - with down-hole means for trapping a fluid sample

• US Classifications

  • 166 - Wells