3055442

Information

• Patent Grant
• 3055442

• References
• Source

• Patent Number

  3,055,442

• Date Filed

  Not available

• Date Issued

  Tuesday, September 25, 1962
  62 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
  • 451 - Abrading