| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 11 | |
| #2 | United States | 2 | |
| #3 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Measurement | |
| #3 | Materials and metallurgy | |
| #4 | Machines | |
| #5 | Thermal processes |
| # | Technology | |
|---|---|---|
| #1 | Special electric heating or lighting | |
| #2 | Electric discharge tubes | |
| #3 | Measuring light | |
| #4 | Alloys | |
| #5 | Measuring distances | |
| #6 | Generating mechanical vibrations | |
| #7 | Details of furnaces |
| # | Name | Total Patents |
|---|---|---|
| #1 | Klein Siegfried | 9 |
| #2 | Siegfried Klein | 2 |
| #3 | Jakob | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2585791A | High-temperature electric resistance oven | |
| GB641602A | A high-temperature electric resistance oven | |
| US2524227A | Thermionic emitting device |