3743357

Information

• Patent Grant
• 3743357

• References
• Source

• Patent Number

  3,743,357

• Date Filed

  Not available

• Date Issued

  Tuesday, July 3, 1973
  51 years ago

• CPC

  • E21C37/04 - by devices with parts pressed mechanically against the wall of a borehole or a slit

• US Classifications

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