2145473

Information

• Patent Grant
• 2145473

• References
• Source

• Patent Number

  2,145,473

• Date Filed

  Not available

• Date Issued

  Tuesday, January 31, 1939
  86 years ago

• CPC

  • E21D1/12 - by freezing
  • E21C37/00 - Other methods or devices for dislodging with or without loading

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 062 - Refrigeration
  • 125 - Stone working
  • 241 - Solid material comminution or disintegration
  • 405 - Hydraulic and earth engineering