3917230

Information

• Patent Grant
• 3917230

• References
• Source

• Patent Number

  3,917,230

• Date Filed

  Not available

• Date Issued

  Tuesday, November 4, 1975
  49 years ago

• CPC

  • E21B19/09 - specially adapted for drilling underwater formations from a floating support using heave compensators supporting the drill string
  • B66D1/50 - for maintaining predetermined rope, cable, or chain tension
  • Y10S254/90 - Cable pulling drum having wave motion responsive actuator for operating drive or rotation retarding means
  • Y10S254/903 - Yieldable, constant engagement, friction coupling

• US Classifications

  • 254 - Implements or apparatus for applying pushing or pulling force
  • 175 - Boring or penetrating the earth
  • 192 - Clutches and power-stop control