Drilling apparatus

• US 3,391,751 A
• Filed: 06/26/1967
• Issued: 07/09/1968
• Est. Priority Date: 06/26/1967
• Status: Expired due to Term

• Current Assignee: Michael R. Caro
• Original Assignee: Michael R. Caro
• Inventors: Caro, Michael R.
• Application Number:
  US04/648,762
• Time in Patent Office: 379 Days
• US Class Current: 175/272
• CPC Class Codes: E02D 17/13 Foundation slots or slits; Implements for making these slots or slits
• CPC Class Codes: E21B 10/06 Roller core bits
• CPC Class Codes: E21B 10/28 with non-expansible roller cutters
• CPC Class Codes: E21B 10/34 of roller-cutter type
• CPC Class Codes: E21B 11/06 with driven cutting chains or similarly driven tools
• CPC Class Codes: E21B 17/10 Wear protectors; Centralising devices , e.g. stabilisers
• CPC Class Codes: E21B 4/16 Plural down-hole drives, e.g. for combined percussion and rotary drilling E21B4/10 takes precedence; Drives for multi-bit drilling units
• CPC Class Codes: E21B 4/18 Anchoring or feeding in the borehole

Claims