3400768

Information

• Patent Grant
• 3400768

• References
• Source

• Patent Number

  3,400,768

• Date Filed

  Not available

• Date Issued

  Tuesday, September 10, 1968
  56 years ago

• CPC

  • H02H7/0857 - by lowering the mechanical load of the motor
  • E21C31/02 - for cutting or breaking-down devices
  • H02P29/0033 - Controlling the mechanical load according to the amount of current drawn or delivered by the motor

• US Classifications

  • 173 - Tool driving or impacting
  • 299 - Mining or in situ disintegration of hard material