Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4490562 | Process for the preparation of a very pure commercial form of 4,2',4'-trichloro-2-hydroxydiphenyl ether | Werner Schreiber | 1984-12-25 |
| 4390476 | Phosphonium compounds, a process for their preparation and a process for the preparation of asymmetrically substituted stilbene fluorescent brightening agents | — | 1983-06-28 |
| 4316860 | Phosphonium compounds, a process for their preparation and a process for the preparation of asymmetrically substituted stilbene fluorescent brightening agents | — | 1982-02-23 |
| 4231957 | Phosphonium compounds, a process for their preparation and a process for the preparation of asymmetrically substituted stilbene fluorescent brightening agents | — | 1980-11-04 |