Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4708150 | Cigarette filter | Andrew McMurtrie | 1987-11-24 |
| 4457319 | Cigarette filter | Harry S. Porenski, Jr. | 1984-07-03 |
| 4438776 | Cigarette filter | Robert A. Sanford | 1984-03-27 |
| 4406294 | Cigarette filter | — | 1983-09-27 |