Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4700724 | Smoking-articles mouthpieces-elements | Martin Graham Duke | 1987-10-20 |
| 4660576 | Smoking articles | Martin Graham Duke | 1987-04-28 |
| 4660579 | Tobacco smoke filters | Martin Graham Duke, James W. P. Phelpstead | 1987-04-28 |
| 4649942 | Smoking articles | Martin Graham Duke | 1987-03-17 |
| 4380241 | Smoking articles | — | 1983-04-19 |
| 4366826 | Smoke filtration | — | 1983-01-04 |
| 4364403 | Smoke filtration | John A. Luke | 1982-12-21 |
| 4300577 | Tobacco-smoke filters | James W. P. Phelpstead | 1981-11-17 |
| 4219033 | Tobacco-smoke filters | John D. Green, John A. Luke, Stanley M. Candlish | 1980-08-26 |
| 4213470 | Tobacco-smoke filters | John D. Green, John A. Luke, Raymond J. Harrison | 1980-07-22 |