Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5445767 | Optical switches | Christoper S. Winter, James D. Rush, Allan E. Underhill, Callum A. S. Hill | 1995-08-29 |
| 4826977 | Photochromic spiropyran compounds | Harry G. Heller, John Whittall, Ian A. Tomlinson | 1989-05-02 |
| 4818096 | Photoreactive lenses with adamantane spiro compounds | Harry G. Heller, John Whittall, Jack Brettle, Clive Trundle, Martin W. Baskerville | 1989-04-04 |
| 4737449 | Photochromic 3-pyrryl fulgides and fulgimides | Harry G. Heller, Stuart Alistair Harris | 1988-04-12 |
| 4685783 | Polychromic tetracyclo-spiro-adamatylidene derivatives, and polychromic lens incorporating said compounds | Harold H. Heller, John Whittal, William Johncock, Paul J. Darcy, Clive Trundle | 1987-08-11 |
| 4576766 | Photochromic compounds and their use in photoreactive lenses | Martin W. Baskerville, William R. Maltman | 1986-03-18 |