| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 7 | |
| #2 | Austria | 2 | |
| #3 | France | 2 | |
| #4 | Switzerland | 1 |
| # | Industry | |
|---|---|---|
| #1 | Materials and metallurgy | |
| #2 | Surface technology and coating |
| # | Technology | |
|---|---|---|
| #1 | Metal tempering | |
| #2 | Metallic material cleaning | |
| #3 | Changing non-ferrous metals |
| # | Name | Total Patents |
|---|---|---|
| #1 | Frey Co W | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE558477C | Bright annealing furnace for wires u. like | |
| DE557568C | Bright annealing furnace for wires u. like | |
| DE564595C | Method and device for annealing metal objects in a salt bath | |
| DE570496C | Annealing process | |
| DE569009C | Process for glowing metal objects in salt-glow baths | |
| DE514366C | Salt bath for glowing metal objects | |
| DE549325C | Salt bath for glowing metal objects |