| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 11 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Electrical machinery and energy | |
| #3 | Environmental technology |
| # | Technology | |
|---|---|---|
| #1 | Shafts | |
| #2 | Reduction of greenhouse gas emissions | |
| #3 | Batteries | |
| #4 | Gearing | |
| #5 | Dynamo-electric machines | |
| #6 | Magnets and transformers |
| Publication | Filing date | Title |
|---|---|---|
| DE510218C | Double electrode for primary and secondary elements formed on two spirally rolled metal bands | |
| DE408297C | Electric collector | |
| DE407630C | Electric collector with electrodes arranged horizontally next to each other in grooves of a flat vessel |