3894772

Information

• Patent Grant
• 3894772

• References
• Source

• Patent Number

  3,894,772

• Date Filed

  Not available

• Date Issued

  Tuesday, July 15, 1975
  49 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