3894587

Information

• Patent Grant
• 3894587

• References
• Source

• Patent Number

  3,894,587

• Date Filed

  Not available

• Date Issued

  Tuesday, July 15, 1975
  49 years ago

• CPC

  • E21B4/18 - Anchoring or feeding in the borehole
  • E02D17/13 - Foundation slots or slits Implements for making these slots or slits
  • E02F3/205 - with a pair of digging wheels
  • E21B4/00 - Drives used in the borehole
  • E21B4/04 - Electric drives
  • E21B4/16 - Plural down-hole drives
  • E21B7/001 - Drilling a non circular hole
  • E21D1/06 - with shaft-boring cutters

• US Classifications

  • 175 - Boring or penetrating the earth