Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11577349 | Method of forming a journal for a roller cone drill bit | Young-Ho Lee | 2023-02-14 |
| 10774593 | Sealing elements for roller cone bits | Shiwei Qin, Douglas Caraway | 2020-09-15 |
| 10619419 | Drill bit having improved journal bearings | Mark E. Williams, Jay S. Bird, Young-Ho Lee | 2020-04-14 |
| 10494872 | Drill bit arm pocket | — | 2019-12-03 |
| 10145178 | Roller cone seal failure detection using an integrated computational element | Shilin Chen | 2018-12-04 |
| 9988850 | Symmetrical seal | Mark E. Williams, Young-Ho Lee, David P. Duckworth, Zhaohui Shan | 2018-06-05 |
| 9359822 | Floating plug pressure equalization in oilfield drill bits | — | 2016-06-07 |
| 8448723 | Seal assembly for drill bit | Pele Jason Nunley, Richard A. Flak | 2013-05-28 |
| 8312942 | Roller cone drill bits with improved fluid flow | Tuck Leong Ho | 2012-11-20 |
| 6290006 | Apparatus and method for a roller bit using collimated jets sweeping separate bottom-hole tracks | — | 2001-09-18 |
| 6260635 | Rotary cone drill bit with enhanced journal bushing | — | 2001-07-17 |
| 6220374 | Rotary cone drill bit with enhanced thrust bearing flange | — | 2001-04-24 |
| 4679640 | Method for case hardening rock bits and rock bits formed thereby | — | 1987-07-14 |
| 4427081 | Rotary rock bit with independently true rolling cutters | — | 1984-01-24 |