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| US5111894 | 19 Feb 1991 | 12 May 1992 | Sybil J. Williams | Uninterrupted drill bit |
| US5311958 | 23 Sep 1992 | 17 May 1994 | Baker Hughes Incorporated | Earth-boring bit with an advantageous cutting structure |
| US5697462 | 7 Aug 1996 | 16 Dec 1997 | Baker Hughes Inc. | Earth-boring bit having improved cutting structure |
| US6347676 | 12 Apr 2000 | 19 Feb 2002 | Schlumberger Technology Corporation | Tooth type drill bit with secondary cutting elements and stress reducing tooth geometry |
