2840348

Information

• Patent Grant
• 2840348

• References
• Source

• Patent Number

  2,840,348

• Date Filed

  Not available

• Date Issued

  Tuesday, June 24, 1958
  66 years ago

• CPC

  • B23B51/0413 - with core-cutting-off devices
  • E21B10/04 - with core destroying means
  • E21B10/445 - percussion type
  • B23B2226/75 - Stone, rock or concrete
  • B23B2251/408 - Spiral grooves
  • B23B2251/50 - Drilling tools comprising cutting inserts

• US Classifications

  • 175 - Boring or penetrating the earth