1327269

Information

• Patent Grant
• 1327269

• References
• Source

• Patent Number

  1,327,269

• Date Filed

  Not available

• Date Issued

  Tuesday, January 6, 1920
  105 years ago

• CPC

  • E21D1/16 - by petrification
  • E21B33/138 - Plastering the borehole wall Injecting into the formations
  • E21B43/2401 - by means of electricity

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 166 - Wells
  • 392 - Electric resistance heating devices