3863723

Information

• Patent Grant
• 3863723

• References
• Source

• Patent Number

  3,863,723

• Date Filed

  Not available

• Date Issued

  Tuesday, February 4, 1975
  49 years ago

• CPC

  • E21B7/14 - Drilling by use of heat
  • E21C37/005 - by projectiles

• US Classifications

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