Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6443246 | Long barrel inserts for earth-boring bit | Rudolf Carl Pessier, Brian C. Wiesner, Matthew R. Isbell, James Lawrence Jacobsen, Brian Baker | 2002-09-03 |
| 5655611 | Earth-boring bit with improved bearing seal | Thomas M. Harris | 1997-08-12 |
| 5524718 | Earth-boring bit with improved bearing seal assembly | Philip B. Kirk, II, Ronald R. Campbell | 1996-06-11 |
| 5295549 | Mechanical lock to prevent seal ring rotation | Douglas J. Clinkscales, Anton F. Zahradnik, Turlach Paul Boylan | 1994-03-22 |
| 4574895 | Solid head bit with tungsten carbide central core | Joseph L. Kelly, Jr. | 1986-03-11 |
| 4515228 | Air groove scraper | Joseph L. Kelly, Jr. | 1985-05-07 |
| 4491428 | Earth boring drill bit with snap ring cutter retention | Bruce H. Burr, Edward M. Galle | 1985-01-01 |
| 4431066 | Stressed relieved bit leg for an earth boring bit | Robert A. Cunningham | 1984-02-14 |
| 4245710 | Centrifugal water-air separation in earth drilling bits | Richard T. Upton | 1981-01-20 |