Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5086808 | Balanced sleeve control choke | — | 1992-02-11 |
| 5074519 | Fail-close hydraulically actuated control choke | — | 1991-12-24 |
| 4693497 | Collet connector | Thomas R. Schmitz | 1987-09-15 |
| 4646840 | Flotation riser | Roy E. Bartholomew, Emanuel Schnitzer, Edmund A. Fisher | 1987-03-03 |