Class E21C : MINING OR QUARRYING
Subclass 25/04: Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam (dislodging machines with slitting means E21C 27/02, E21C 27/1, E21C 27/18) Machines slitting solely by one or more percussive tools moved through the seam Cutting crowns or other tools (percussion drill bits E21B 10/36)
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 8720612 | Cutting element and a method of manufacturing a cutting element | Nov 23, 09 | May 13, 14 | SMITH INTERNATIONAL, INC. |
| 7779901 | Downhole debris catcher and associated mill | Mar 18, 09 | Aug 24, 10 | BAKER HUGHES INCORPORATED |
| 7703556 | Methods of attaching a shank to a body of an earth-boring tool including a load-bearing joint and tools formed by such methods | Jun 04, 08 | Apr 27, 10 | BAKER HUGHES INCORPORATED |
| 6733087 | Pick for disintegrating natural and man-made materials | Aug 10, 02 | May 11, 04 | SCHLUMBERGER TECHNOLOGY CORPORATION |
| 6491117 | Apparatus for retrieving metal debris from a well bore | Apr 05, 01 | Dec 10, 02 | ABRADO, INC. |
| 6357539 | Apparatus for retrieving metal objects from a wellbore | Jun 22, 00 | Mar 19, 02 | ABRADO, INC. |
| 6308781 | Apparatus for retrieving metal objects from a wellbore | Feb 21, 01 | Oct 30, 01 | ABRADO, INC. |
| 6216787 | Apparatus for retrieving metal objects from a wellbore | Oct 21, 99 | Apr 17, 01 | ABRADO, INC. |
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