Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861899 | Photochromic gamma butyrolactones | — | 1989-08-29 |
| 4838634 | Organic optical waveguides and method of fabricating waveguide structures | Ian Bennion, Jack Brettle, Martin J. Goodwin, Robert Glenn | 1989-06-13 |
| 4818096 | Photoreactive lenses with adamantane spiro compounds | Harry G. Heller, Stephen N. Oliver, John Whittall, Jack Brettle, Martin W. Baskerville | 1989-04-04 |
| 4812171 | Irreversible photochromic markings | Jack Brettle | 1989-03-14 |