3887021

Information

• Patent Grant
• 3887021

• References
• Source

• Patent Number

  3,887,021

• Date Filed

  Not available

• Date Issued

  Tuesday, June 3, 1975
  49 years ago

• CPC

  • E21B7/18 - Drilling by liquid or gas jets, with or without entrained pellets
  • E02D19/10 - by lowering level of ground water
  • E21B43/04 - Gravelling of wells

• US Classifications

  • 175 - Boring or penetrating the earth
  • 405 - Hydraulic and earth engineering