Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4638820 | Puff control cigarette | Donald L. Roberts, Douglas C. Clark, Jack F. Clearman, T. Stephen Sink | 1987-01-27 |
| 4488887 | Cold trap | James L. Harris, Michael Francis Dube | 1984-12-18 |