2815931

Information

• Patent Grant
• 2815931

• References
• Source

• Patent Number

  2,815,931

• Date Filed

  Not available

• Date Issued

  Tuesday, December 10, 1957
  67 years ago

• CPC

  • E21B7/16 - Applying separate balls or pellets by the pressure of the drill, so-called shot-drilling

• US Classifications

  • 175 - Boring or penetrating the earth