Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5265303 | Pipeline pig implement and retaining apparatus | — | 1993-11-30 |
| 4663795 | Pig apparatus | — | 1987-05-12 |
| 4275475 | Pipeline pig | Robert E. Schwartz, Gary N. Utter | 1981-06-30 |