3900226

Information

• Patent Grant
• 3900226

• References
• Source

• Patent Number

  3,900,226

• Date Filed

  Not available

• Date Issued

  Tuesday, August 19, 1975
  49 years ago

• CPC

  • E21C25/60 - Slitting by jets of water or other liquid
  • E21C41/18 - for brown or hard coal
  • E21C41/22 - for ores

• US Classifications

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