3905430

Information

• Patent Grant
• 3905430

• References
• Source

• Patent Number

  3,905,430

• Date Filed

  Not available

• Date Issued

  Tuesday, September 16, 1975
  49 years ago

• CPC

  • E21D9/1066 - with fluid jets
  • E21B7/18 - Drilling by liquid or gas jets, with or without entrained pellets
  • E21B7/28 - Enlarging drilled holes
  • E21D3/00 - Raising shafts

• US Classifications

  • 175 - Boring or penetrating the earth
  • 299 - Mining or in situ disintegration of hard material