3597929

Information

• Patent Grant
• 3597929

• References
• Source

• Patent Number

  3,597,929

• Date Filed

  Not available

• Date Issued

  Tuesday, August 10, 1971
  54 years ago

• CPC

  • E21D9/04 - Driving tunnels or galleries through loose materials Apparatus therefor not otherwise provided for
  • E21B7/24 - Drilling using vibrating or oscillating means
  • E21D9/1053 - for making a slit along the perimeter of the tunnel profile, the remaining core being removed subsequently

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 173 - Tool driving or impacting
  • 175 - Boring or penetrating the earth