Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5955520 | Photochromic indeno-fused naphthopyrans | Julian Levell | 1999-09-21 |
| 5916943 | Method of marking an article | Mark John Vincent | 1999-06-29 |
| 5200116 | Photochromic chromene compounds | — | 1993-04-06 |
| 4980089 | Photochromic spiropyran compounds | — | 1990-12-25 |
| 4931221 | Photochromic spiropyran compounds | — | 1990-06-05 |
| 4826977 | Photochromic spiropyran compounds | Stephen N. Oliver, John Whittall, Ian A. Tomlinson | 1989-05-02 |
| 4818096 | Photoreactive lenses with adamantane spiro compounds | Stephen N. Oliver, John Whittall, Jack Brettle, Clive Trundle, Martin W. Baskerville | 1989-04-04 |
| 4737449 | Photochromic 3-pyrryl fulgides and fulgimides | Stephen N. Oliver, Stuart Alistair Harris | 1988-04-12 |