3885832

Information

• Patent Grant
• 3885832

• References
• Source

• Patent Number

  3,885,832

• Date Filed

  Not available

• Date Issued

  Tuesday, May 27, 1975
  49 years ago

• CPC

  • E21D9/1073 - applying thermal energy

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 175 - Boring or penetrating the earth