3837707

Information

• Patent Grant
• 3837707

• References
• Source

• Patent Number

  3,837,707

• Date Filed

  Not available

• Date Issued

  Tuesday, September 24, 1974
  50 years ago

• CPC

  • E21F13/042 - Vertical hydraulic conveying of coal
  • E21C25/60 - Slitting by jets of water or other liquid
  • E21C35/20 - General features of equipment for removal of chippings
  • E21C37/00 - Other methods or devices for dislodging with or without loading
  • E21C41/16 - Methods of underground mining Layouts therefor
  • E21F13/04 - Transport of mined material in gravity inclines in staple or inclined shafts

• US Classifications

  • 299 - Mining or in situ disintegration of hard material