3640580

Information

• Patent Grant
• 3640580

• References
• Source

• Patent Number

  3,640,580

• Date Filed

  Not available

• Date Issued

  Tuesday, February 8, 1972
  52 years ago

• CPC

  • E21C35/22 - Equipment for preventing the formation of, or for removal of, dust
  • E21C27/02 - solely by slitting
  • E21C35/16 - by making use of the timbering, filling, or other supports

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 055 - Gas separation