Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4292269 | Method of manufacturing a ring spring for composite machinery seals | — | 1981-09-29 |
| 4261583 | Unitary rod gland assembly | Donald S. de Vries, Jr. | 1981-04-14 |
| 4232873 | Ring spring for composite machinery seals and method of manufacturing same | — | 1980-11-11 |
| 4214507 | One-piece plastic piston | Donald S. de Vries, Jr. | 1980-07-29 |