2495840

Information

• Patent Grant
• 2495840

• References
• Source

• Patent Number

  2,495,840

• Date Filed

  Not available

• Date Issued

  Tuesday, January 31, 1950
  75 years ago

• CPC

  • E21C27/10 - by both slitting and breaking-down
  • E21C41/24 - for oil-bearing deposits

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 173 - Tool driving or impacting