3809439

Information

• Patent Grant
• 3809439

• References
• Source

• Patent Number

  3,809,439

• Date Filed

  Not available

• Date Issued

  Tuesday, May 7, 1974
  50 years ago

• CPC

  • E21F5/10 - Devices for rock dusting
  • E21F5/20 - Drawing-off or depositing dust

• US Classifications

  • 406 - Conveyors: fluid current