| Patent Number |
Title Of Patent |
Date Issued |
| 6374704 |
Steel-tooth bit with improved toughness |
April 23, 2002 |
| An earth boring bit is shown having a bit body and at least one cutter rotatably secured to the bit body. The cutter has a plurality of teeth formed integrally thereon and arranged in circumferential rows. Each of the teeth includes an outer end, an inner end, a pair of flanks and a |
| 6105694 |
Diamond enhanced insert for rolling cutter bit |
August 22, 2000 |
| An earth-boring bit has a bit body and a cantilevered bearing shaft depending from the bit body. The cutter is mounted for rotation on the bearing shaft. Cutting elements are secured within holes formed in the cutter. At least some of the cutting elements include a body of hard metal |
| 6068070 |
Diamond enhanced bearing for earth-boring bit |
May 30, 2000 |
| An earth-boring bit is formed having a bit body in a cantilevered bearing shaft that depends from the bit body. The bearing shaft is provided with a journal bearing surface. A cutter is mounted to the bearing shaft and has a mating bearing surface for engagement with the journal bearing |
| 6050354 |
Rolling cutter bit with shear cutting gage |
April 18, 2000 |
| An earth-boring bit of the rolling cutter variety is provided with hard gage inserts that protrude from the gage surface of the cutter to engage the side of the borehole for holding gage. The gage insert has a substantially flat face with sharp cutting edges formed thereon and has cu |
| 6045029 |
Earth-boring bit with improved rigid face seal |
April 4, 2000 |
| An earth-boring bit has a bit body, at least one cantilevered bearing shaft, including a base and a cylindrical journal bearing surface extending inwardly and downwardly from the bit body, and at least one cutter mounted for rotation on the cylindrical journal bearing surface of the |
| 5979571 |
Combination milling tool and drill bit |
November 9, 1999 |
| A combination metal milling and earth drilling tool, for use in performing a single trip kickoff from a casing in a well bore. The combination milling and drilling tool has a first, relatively more durable cutting structure, such as tungsten carbide, and a second, relatively harder c |
| 5954147 |
Earth boring bits with nanocrystalline diamond enhanced elements |
September 21, 1999 |
| An earth boring bit is shown of the type used to drill subterranean formations. The bit body has an upper extent which is threaded for connection in a drill string extending to the earth's surface. A lower extent of the bit body has a number of cutting elements mounted thereon which |
| 5819861 |
Earth-boring bit with improved cutting structure |
October 13, 1998 |
| An earth-boring bit has a bit body and at least one cutter rotatably secured to the bit body. The cutter has a cutter shell surface including a gage surface and a heel surface. A plurality of cutting elements inserts are arranged in generally circumferential rows on the cutter. At least |
| 5655612 |
Earth-boring bit with shear cutting gage |
August 12, 1997 |
| An earth-boring bit is provided with hard gage inserts that protrude from the gage surface of the cutter to engage the side of the borehole for holding gage. The cutting end of the gage insert has a cutting end defining at least one sharp cutting edge and at least one cutting surface |
