Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4738839 | Process for the preparation of precipitated silica | — | 1988-04-19 |
| 4370148 | Chlorofluoroferrate(II,III), a process for its manufacture, its use and a grinding wheel containing chlorofluoroferrate(II,III) | Rudolf Hirschberg | 1983-01-25 |
| 4297390 | Process for the preparation of a red emitting phosphor coated with red iron oxide and its application | Karl Franz | 1981-10-27 |
| 4263016 | Non-toxic, active filler for grinding disks, its use and grinding disk containing same | Rudolf Hirschberg | 1981-04-21 |