3791460

Information

• Patent Grant
• 3791460

• References
• Source

• Patent Number

  3,791,460

• Date Filed

  Not available

• Date Issued

  Tuesday, February 12, 1974
  51 years ago

• CPC

  • E21B7/025 - Rock drills
  • E21B7/022 - Control of the drilling operation; Hydraulic or pneumatic means for activation or operation
  • E21C3/02 - Machines in which the tool is connected to an impulse member
  • F15B21/02 - Servomotor systems with programme control derived from a store or timing device Control devices therefor
  • F15B21/087 - Control strategy

• US Classifications

  • 173 - Tool driving or impacting