2868509

Information

• Patent Grant
• 2868509

• References
• Source

• Patent Number

  2,868,509

• Date Filed

  Not available

• Date Issued

  Tuesday, January 13, 1959
  66 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
  • 324 - Electricity: measuring and testing
  • 451 - Abrading