3811515

Information

• Patent Grant
• 3811515

• References
• Source

• Patent Number

  3,811,515

• Date Filed

  Not available

• Date Issued

  Tuesday, May 21, 1974
  50 years ago

• CPC

  • E21B6/08 - Separate drives for percussion and rotation

• US Classifications

  • 173 - Tool driving or impacting
  • 418 - Rotary expansible chamber devices