3842279

Information

• Patent Grant
• 3842279

• References
• Source

• Patent Number

  3,842,279

• Date Filed

  Not available

• Date Issued

  Tuesday, October 15, 1974
  50 years ago

• CPC

  • E21C41/16 - Methods of underground mining Layouts therefor
  • E21C37/16 - by fire-setting or by similar methods based on a heat effect
  • E21C37/18 - by electricity
  • E21D9/1073 - applying thermal energy
  • H01J37/1471 - for centering, aligning or positioning of ray or beam
  • H01J37/301 - Arrangements enabling beams to pass between regions of different pressure

• US Classifications

  • 250 - Radiant energy