Issued Patents 2021
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11183909 | Squirrel-cage rotor, in particular for high rotational speeds | Klaus Büttner, Klaus Kirchner | 2021-11-23 |
| 11043868 | Squirrel cage rotor of an asynchronous machine | Klaus Büttner, Klaus Kirchner | 2021-06-22 |
| 10910919 | Dynamoelectric machine having a thermosiphon | Klaus Büttner, Klaus Kirchner | 2021-02-02 |