Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4574019 | Process for attaching anode blocks to an anode suspension means | Hans R. Friedli | 1986-03-04 |
| 4416489 | Chisel for a crust breaking facility | Thomas Haggenmacher, Hans R. Friedli, Gottfried Maugweiler | 1983-11-22 |
| 4380492 | Method of using a chisel for a crust breaking facility | Erwin Arnold, Hans R. Friedli | 1983-04-19 |
| 4349231 | Chisel alignment unit for a crust breaking facility | Erwin Arnold, Gottfried Maugweiler, Hans R. Friedli | 1982-09-14 |
| 4328085 | Device for servicing electrolytic cells | Hans R. Friedli, Peter Aeschbach | 1982-05-04 |
| 4317595 | Chisel for a crust breaking facility | Erwin Arnold, Hans R. Friedli | 1982-03-02 |