3858666

Information

• Patent Grant
• 3858666

• References
• Source

• Patent Number

  3,858,666

• Date Filed

  Not available

• Date Issued

  Tuesday, January 7, 1975
  50 years ago

• CPC

  • E21B6/00 - Drives for combined percussion and rotary drilling
  • Y10S173/01 - Operable submerged in liquid
  • Y10S173/02 - Sound muffling

• US Classifications

  • 173 - Tool driving or impacting
  • 418 - Rotary expansible chamber devices