3290095

Information

• Patent Grant
• 3290095

• References
• Source

• Patent Number

  3,290,095

• Date Filed

  Not available

• Date Issued

  Tuesday, December 6, 1966
  58 years ago

• CPC

  • E21C27/20 - Mineral freed by means not involving slitting
  • E21D9/11 - with a rotary drilling-head cutting simultaneously the whole cross-section

• US Classifications

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