Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5244860 | Pressure-sensitive recording and transfer material | Rene Graf, Werner Mischler | 1993-09-14 |
| 4369326 | Carbazolylmethane compounds | Jean C. Petitpierre | 1983-01-18 |
| 4355823 | Pressure-sensitive or heat-sensitive recording material | — | 1982-10-26 |
| 4343944 | Indolinospiropyrane compounds | — | 1982-08-10 |
| 4339385 | Indolinospiropyrane compounds | — | 1982-07-13 |
| 4291902 | Recording material employing substituted 3,6-diaminophthalides as color formers | — | 1981-09-29 |
| 4275005 | Carbazolylmethane compounds | Jean C. Petitpierre | 1981-06-23 |
| 4254032 | Carbazolylmethane compounds | Jean C. Petitpierre | 1981-03-03 |
| 4238130 | Pressure-sensitive or heat-sensitive recording material | — | 1980-12-09 |
| 4210591 | Indolinospiropyrane compounds | — | 1980-07-01 |
| 4202820 | Pressure-sensitive or heat-sensitive recording material containing a carbazolyl methane compound | — | 1980-05-13 |
| 4191690 | Substituted 3,6-diaminophthalides | — | 1980-03-04 |