2913225

Information

• Patent Grant
• 2913225

• References
• Source

• Patent Number

  2,913,225

• Date Filed

  Not available

• Date Issued

  Tuesday, November 17, 1959
  65 years ago

• CPC

  • E21B21/012 - using exhaust air from the drilling motor for blowing off the dust at the borehole entrance

• US Classifications

  • 175 - Boring or penetrating the earth
  • 173 - Tool driving or impacting