Issued Patents All Time
Showing 26–48 of 48 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4649026 | Diagnostic strips | Peter J. Elton, David P. Gregory | 1987-03-10 |
| 4643588 | Method of monitoring temperature | Roy Barber | 1987-02-17 |
| 4609620 | Pyrazolone compounds and a process for their manufacture | William E. Long | 1986-09-02 |
| 4578305 | Photochromic assembly comprising photochromic glass beads in polymer latex | Samuel B. Kingston | 1986-03-25 |
| 4560646 | Protected developing agents | William E. Long, Norman Alfred Smith, Terence C. Webb, Kenneth M. McCombe, Martin C. Grossel | 1985-12-24 |
| 4489108 | Photochromic assembly and manufacture of this assembly | Samuel B. Kingston | 1984-12-18 |
| 4481252 | Sheet material | James Doyle | 1984-11-06 |
| 4480104 | Hydroquinone derivatives and their use in photographic materials | Patrick D. P. Thomas | 1984-10-30 |
| 4446216 | Photographic material | Norman Alfred Smith, William E. Long | 1984-05-01 |
| 4444939 | Photochromic paint | Samuel B. Kingston | 1984-04-24 |
| 4443537 | Hydroquinone derivatives and their use in photographic materials | Patrick D. P. Thomas, Brian R. D. Whitear | 1984-04-17 |
| 4439518 | Process for the production of a photographic image | — | 1984-03-27 |
| 4426444 | Hydroquinone derivatives and their use in photographic materials | Patrick D. P. Thomas | 1984-01-17 |
| 4417072 | Hydroquinone derivatives and their use in photographic materials | Patrick D. P. Thomas, Brian R. D. Whitear | 1983-11-22 |
| 4410702 | Hydroquinone derivatives of pyridinecarboxylic acids | Patrick D. P. Thomas | 1983-10-18 |
| 4387158 | Photographic materials | — | 1983-06-07 |
| 4369310 | Bleachable dyes | — | 1983-01-18 |
| 4360588 | Photographic element containing a UV-filter layer | — | 1982-11-23 |
| 4359523 | Photographic element containing a UV-filter layer | — | 1982-11-16 |
| 4359522 | Photographic element containing a UV-filter layer | — | 1982-11-16 |
| 4294916 | Photographic silver halide material containing a dye filter or a dye anti-halation layer | Alexander F. Psaila | 1981-10-13 |
| 4294917 | Photographic silver halide material containing a dye filter or a dye anti-halation layer | Alexander F. Psaila | 1981-10-13 |
| 4234677 | Pyrazolone dyestuffs and their use in photographic materials | — | 1980-11-18 |