2621022

Information

• Patent Grant
• 2621022

• References
• Source

• Patent Number

  2,621,022

• Date Filed

  Not available

• Date Issued

  Tuesday, December 9, 1952
  72 years ago

• CPC

  • E21D1/12 - by freezing
  • E21B33/10 - in the borehole
  • E21B36/001 - Cooling arrangements
  • Y10T24/3902 - Chain

• US Classifications

  • 175 - Boring or penetrating the earth
  • 024 - Buckles, buttons, clasps, etc.
  • 405 - Hydraulic and earth engineering