Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8622122 | Rod reel and method of repairing a rod string | Patrick Demers | 2014-01-07 |
| 6718989 | Filter for a cigarette and a filter-tipped cigarette | Paul Francis Clarke, Ichiro Atobe, Atsushi Tokida | 2004-04-13 |
| 6422244 | Filter for a cigarette and filter cigarette | Paul Francis Clarke, Ichiro Atobe, Masanori Koborinai | 2002-07-23 |
| 6302114 | Tobacco smoke filter | Paul Francis Clarke | 2001-10-16 |
| 6080457 | Particulate sorbent smoke filter | Paul Francis Clarke, Ernest B. Hayes | 2000-06-27 |
| 5787902 | Concentric core filter | Richard Karl James Shepherd, Paul Francis Clarke | 1998-08-04 |
| 5775746 | Retractable door stop security device/utility box | — | 1998-07-07 |
| 5755582 | Retractable door stop security device/utility box | — | 1998-05-26 |
| 5662126 | Smoke filter containing particulate smoke modifying additive | Paul Francis Clarke | 1997-09-02 |
| 4904308 | Adjustable smoker's mouthpiece | Paul Francis Clarke | 1990-02-27 |
| 4839299 | Assay for the free portion of substances in biological fluids | John E. Midgley, Terence A. Wilkins | 1989-06-13 |
| 4797970 | Foot-operated door security device | — | 1989-01-17 |