3826536

Information

• Patent Grant
• 3826536

• References
• Source

• Patent Number

  3,826,536

• Date Filed

  Not available

• Date Issued

  Tuesday, July 30, 1974
  50 years ago

• CPC

  • E21D9/1073 - applying thermal energy
  • E21C27/28 - by percussive drills with breaking-down means
  • E21C37/16 - by fire-setting or by similar methods based on a heat effect

• US Classifications

  • 299 - Mining or in situ disintegration of hard material