3776321

Information

• Patent Grant
• 3776321

• References
• Source

• Patent Number

  3,776,321

• Date Filed

  Not available

• Date Issued

  Tuesday, December 4, 1973
  51 years ago

• CPC

  • E21B49/04 - using explosives in boreholes using projectiles penetrating the wall
  • E21B43/119 - Details

• US Classifications

  • 175 - Boring or penetrating the earth