Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889702 | Process for removing metallic constituents from dust obtained during the electrothermal production of yellow phosphorus | Friedrich Kolkmann | 1989-12-26 |
| 4517163 | Process for making titanium dioxide concentrates | Gero Heymer, Hans-Werner Stephan | 1985-05-14 |
| 4385041 | Process for making aqueous alkali metal phosphate solutions | Gero Heymer | 1983-05-24 |
| 4355010 | Process for removing phosphorus in vapor form and phosphanes from gas mixtures | Friedrich-Wilhelm Dorn, Gero Heymer, Hans-Werner Stephan | 1982-10-19 |
| 4278647 | Production of phosphorous acid | Hans-Werner Stephan, Gero Heymer | 1981-07-14 |