Patents per Year
Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 4836306 | Down hole drill chuck lock | — | 1989-06-06 | $2,835,000 |
| 4598796 | Lubricator | — | 1986-07-08 | $4,149,000 |
| 4450938 | Air line lubricator | Henry A. Davenport | 1984-05-29 | $2,105,000 |
| 4261452 | Overrunning clutch | — | 1981-04-14 | $8,099,000 |