Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5387694 | Chromogenic methylenepyrrolines | — | 1995-02-07 |
| 5166350 | Process for the manufacture of fluoran compounds | Jerry L. Pool, Brian John Williams, Robert Garner, John Barry Henshall | 1992-11-24 |
| 5071986 | Chromogenic phthalides and azaphthalides | Rox Phaff | 1991-12-10 |
| 5004813 | Chromogenic phthalides and azaphthalides | Rox Phaff | 1991-04-02 |
| 4876357 | Chromogenic phthalides and azaphthalides | Rox Phaff | 1989-10-24 |
| 4705776 | Recording material containing chromogenic 3,3-bisindolyl-4-azaphthalides | Ian J. Fletcher | 1987-11-10 |
| 4695636 | Chromogenic dihydrofuropyridinones | Ian J. Fletcher | 1987-09-22 |
| 4675407 | Ring-substituted 4-azaphthalides | Ian J. Fletcher | 1987-06-23 |
| 4668790 | Chromogenic dihydrofuropyridinones | Ian J. Fletcher | 1987-05-26 |
| 4587343 | Chromogenic 3,3-bisindolyl-4-azaphthalides | Ian J. Fletcher | 1986-05-06 |
| 4587539 | Chromogenic dihydrofuropyridinones | Ian J. Fletcher | 1986-05-06 |
| 4562449 | Chromogenic dihydroquinazolines | Heinz Balli, Sigmund Gunzenhauser, Ian J. Fletcher | 1985-12-31 |
| 4508897 | Preparation of chromogenic azaphthalides | Ian J. Fletcher | 1985-04-02 |
| 4506073 | Chromenoazaindolizine compounds | Heinz Balli, Sigmund Gunzenhauser, Ian J. Fletcher | 1985-03-19 |
| 4503227 | Chromogenic dihydroquinazolines | Heinz Balli, Sigmund Gunzenhauser, Ian J. Fletcher | 1985-03-05 |