3866468

Information

• Patent Grant
• 3866468

• References
• Source

• Patent Number

  3,866,468

• Date Filed

  Not available

• Date Issued

  Tuesday, February 18, 1975
  49 years ago

• CPC

  • G01P3/4805 - by using circuits for the electrical integration of the generated pulses
  • E21B21/08 - Controlling or monitoring pressure or flow of drilling fluid
  • E21B44/00 - Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator
  • E21B45/00 - Measuring the drilling time or rate of penetration
  • G01P1/103 - by comparing the value of the measured signal with one or several reference values

• US Classifications

  • 073 - Measuring and testing