Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10066463 | Plunger assembly with internal dart passage | — | 2018-09-04 |
| 9951590 | Plunger assembly with dampening system | — | 2018-04-24 |
| 9945209 | Plunger assembly with expandable seal | — | 2018-04-17 |
| 9863218 | Plunger assembly with coated dart and wear pads | — | 2018-01-09 |
| 9863223 | Plunger assembly with dual dart system | — | 2018-01-09 |
| 4199856 | Method of providing lubricant volume displacement system for a rotary rock bit | William D. Vanderford, Ernest E. Taylor | 1980-04-29 |