3824911

Information

• Patent Grant
• 3824911

• References
• Source

• Patent Number

  3,824,911

• Date Filed

  Not available

• Date Issued

  Tuesday, July 23, 1974
  50 years ago

• CPC

  • E21F7/00 - Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
  • E21F1/00 - Ventilation of mines or tunnels Distribution of ventilating currents
  • E21F1/006 - Ventilation at the working face of galleries or tunnels
  • E21F1/18 - Gravity flow ventilation

• US Classifications

  • 454 - Ventilation
  • 299 - Mining or in situ disintegration of hard material