3860290

Information

• Patent Grant
• 3860290

• References
• Source

• Patent Number

  3,860,290

• Date Filed

  Not available

• Date Issued

  Tuesday, January 14, 1975
  50 years ago

• CPC

  • E21D9/106 - with percussive tools
  • E21C27/28 - by percussive drills with breaking-down means

• US Classifications

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