3897837

Information

• Patent Grant
• 3897837

• References
• Source

• Patent Number

  3,897,837

• Date Filed

  Not available

• Date Issued

  Tuesday, August 5, 1975
  49 years ago

• CPC

  • E21B10/25 - characterised by sealing details
  • E21B10/18 - characterised by conduits or nozzles for drilling fluids
  • E21B10/246 - with pumping means for feeding lubricant
  • E21B10/30 - Longitudinal axis roller reamers
  • E21B10/52 - with chisel or button type inserts

• US Classifications

  • 175 - Boring or penetrating the earth