| Patent Number |
Title Of Patent |
Date Issued |
| 6619412 |
Protected lubricant reservoir for sealed earth boring drill bit |
September 16, 2003 |
| A rotary cone rock bit, comprises a bit body including a plurality of legs extending therefrom, each of the legs having an outer surface that includes a leading surface and a trailing surface, a roller cone rotatably supported on each of the legs, a bearing system between each cone and t |
| 6296067 |
Protected lubricant reservoir for sealed bearing earth boring drill bit |
October 2, 2001 |
| A rotary cone rock bit, comprises a bit body including a plurality of legs extending therefrom, each of the legs having an outer surface that includes a leading surface and a trailing surface, a roller cone rotatably supported on each of the legs, a bearing system between each cone and t |
| 6206110 |
Protected lubricant reservoir with pressure control for sealed bearing earth boring drill bit |
March 27, 2001 |
| A rotary cone rock bit, comprises a bit body including a plurality of legs extending therefrom, each of the legs having an outer surface that includes a leading surface and a trailing surface, a roller cone rotatably supported on each of the legs, a bearing system between each cone and t |
| 6116357 |
Rock drill bit with back-reaming protection |
September 12, 2000 |
| A drill bit for boring a bore hole in an earthen formation comprises: a bit body having a pin end, a cutting end and a longitudinal bit axis and including at least two legs extending from the cutting end, each of the legs including a bearing that rotatably supports a cutter cone. The bit |
| 5415243 |
Rock bit borhole back reaming method |
May 16, 1995 |
| A method to back ream a borehole drilled with a roller cone drill bit is taught. Protruding hard metal cutting inserts are affixed on the upper outside diameter tapered shoulder of each of the bit legs. If the borehole closes to a smaller diameter than the bit gage diameter or loose rock |
