3921731

Information

• Patent Grant
• 3921731

• References
• Source

• Patent Number

  3,921,731

• Date Filed

  Not available

• Date Issued

  Tuesday, November 25, 1975
  49 years ago

• CPC

  • E21B6/00 - Drives for combined percussion and rotary drilling
  • B25D17/084 - Rotating chucks or sockets
  • B25D17/265 - the lubricant being entrained to the machine parts by the driving fluid
  • Y10S173/03 - Lubrication

• US Classifications

  • 173 - Tool driving or impacting