Issued Patents All Time
Showing 26–41 of 41 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4806657 | Process for the preparation of fluoran compounds which are substituted by basic groups | — | 1989-02-21 |
| 4770904 | Process for the preparation of a pressure-sensitive recording material | — | 1988-09-13 |
| 4766211 | Chromogenic quinazolines | Ian J. Fletcher | 1988-08-23 |
| 4705775 | Recording material employing chromogenic bisquinazolines | Ian J. Fletcher | 1987-11-10 |
| 4668966 | Aliphatic bridged chromogenic bisquinazolines substituted with phenylamine or phenyl-containing heterobicyclic radicals | Ian J. Fletcher | 1987-05-26 |
| 4625027 | Bisquinazolines useful in color former systems | Ian J. Fletcher | 1986-11-25 |
| 4555569 | Chromogenic quinazolines | Ian J. Fletcher | 1985-11-26 |
| 4525588 | Chromogenic naphtholactams | — | 1985-06-25 |
| 4421519 | Mixtures of cationic dyes: naphtho-lactam and oxazine dyes for polyacrylonitriles | Peter Loew | 1983-12-20 |
| 4403095 | Methine compounds | — | 1983-09-06 |
| 4372886 | Process for the production of carbinol bases from indoline compounds | Peter Loew | 1983-02-08 |
| 4364738 | Crystalline bromide or iodide salts of triazole dyes for polyacrylonitrile | Peter Loew | 1982-12-21 |
| 4332937 | Naphtholactam compounds | — | 1982-06-01 |
| 4288589 | Cationic dyes | Peter Loew | 1981-09-08 |
| 4259236 | Azo compounds, containing a 1,2,4-thiadiazole moiety | Stefan Koller, Hansrudolf Schwander | 1981-03-31 |
| 4251656 | Cationic dyes | Peter Loew, Stefan Koller | 1981-02-17 |