Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5360076 | Dual metal face seal with single recessed energizer | Joseph L. Kelly, Jr. | 1994-11-01 |
| 5307887 | Earth boring bit with improved thrust bearing | — | 1994-05-03 |
| 4923020 | Rock bit with rigid face seals and recessed energizers | Joseph H. Kelly, Jr. | 1990-05-08 |
| 4903786 | Earth boring bit with improved two piece bearing and seal assembly | — | 1990-02-27 |