3896890

Information

• Patent Grant
• 3896890

• References
• Source

• Patent Number

  3,896,890

• Date Filed

  Not available

• Date Issued

  Tuesday, July 29, 1975
  49 years ago

• CPC

  • E02D5/801 - driven by screwing
  • E02D2200/1671 - helical or spiral

• US Classifications

  • 175 - Boring or penetrating the earth
  • 052 - Static structures
  • 173 - Tool driving or impacting
  • 405 - Hydraulic and earth engineering