3767263

Information

• Patent Grant
• 3767263

• References
• Source

• Patent Number

  3,767,263

• Date Filed

  Not available

• Date Issued

  Tuesday, October 23, 1973
  51 years ago

• CPC

  • E21B4/18 - Anchoring or feeding in the borehole
  • E21B7/003 - Drilling with mechanical conveying means
  • E21D9/008 - Driving transverse tunnels starting from existing tunnels
  • E21D9/087 - with a rotary drilling-head cutting simultaneously the whole cross-section
  • E21D9/10 - Making by using boring or cutting machines
  • E21D9/12 - Devices for removing or hauling away excavated material or spoil Working or loading platforms

• US Classifications

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