3830321

Information

• Patent Grant
• 3830321

• References
• Source

• Patent Number

  3,830,321

• Date Filed

  Not available

• Date Issued

  Tuesday, August 20, 1974
  50 years ago

• CPC

  • E21C35/183 - with inserts or layers of wear-resistant material
  • E21B10/02 - Core bits
  • E21B10/26 - Drill bits with leading portion, i.e. drill bits with a pilot cutter Drill bits for enlarging the borehole
  • E21B10/62 - characterised by parts
  • E21C25/04 - Cutting crowns or other tools
  • E21C2035/1816 - characterised by the shape

• US Classifications

  • 175 - Boring or penetrating the earth
  • 299 - Mining or in situ disintegration of hard material