1342780

Information

• Patent Grant
• 1342780

• References
• Source

• Patent Number

  1,342,780

• Date Filed

  Not available

• Date Issued

  Tuesday, June 8, 1920
  104 years ago

• CPC

  • E21D1/12 - by freezing
  • E21B33/10 - in the borehole
  • E21B36/003 - Insulating arrangements

• US Classifications

  • 166 - Wells
  • 405 - Hydraulic and earth engineering