3820063

Information

• Patent Grant
• 3820063

• References
• Source

• Patent Number

  3,820,063

• Date Filed

  Not available

• Date Issued

  Tuesday, June 25, 1974
  50 years ago

• CPC

  • E21B47/18 - through the well fluid
  • E21B3/00 - Rotary drilling
  • H02P23/186 - of one shaft by controlling the prime mover
  • Y10S388/90 - Specific system operational feature
  • Y10S388/901 - Sample and hold
  • Y10S388/911 - Phase locked loop
  • Y10S388/922 - Tuned or resonant circuit

• US Classifications

  • 367 - Communications, electrical: acoustic wave systems and devices
  • 175 - Boring or penetrating the earth
  • 324 - Electricity: measuring and testing
  • 388 - Electricity: motor control systems