3421794

Information

• Patent Grant
• 3421794

• References
• Source

• Patent Number

  3,421,794

• Date Filed

  Not available

• Date Issued

  Tuesday, January 14, 1969
  55 years ago

• CPC

  • E21C41/20 - for rock salt or potash salt
  • E21B43/281 - using heat
  • Y10S159/902 - using natural heat

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 159 - Concentrating evaporators