3881777

Information

• Patent Grant
• 3881777

• References
• Source

• Patent Number

  3,881,777

• Date Filed

  Not available

• Date Issued

  Tuesday, May 6, 1975
  49 years ago

• CPC

  • E21D9/11 - with a rotary drilling-head cutting simultaneously the whole cross-section
  • E21D9/04 - Driving tunnels or galleries through loose materials Apparatus therefor not otherwise provided for
  • E21D9/1053 - for making a slit along the perimeter of the tunnel profile, the remaining core being removed subsequently
  • E21D9/1073 - applying thermal energy
  • E21D11/00 - Lining tunnels, galleries or other underground cavities
  • Y10S376/909 - Mobile reactors

• US Classifications

  • 376 - Induced nuclear reactions: processes, systems, and elements
  • 175 - Boring or penetrating the earth
  • 299 - Mining or in situ disintegration of hard material