Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4601351 | Electrically driven hammer machine | Carl S. M. Hartwig, Sven H. Johansson | 1986-07-22 |
| 4570213 | Static converter switch with fast recovery freewheel diode | — | 1986-02-11 |
| 4550282 | Method and device for controlling a brushless alternating current motor | Carl S. M. Hartwig, Erik M. Obel | 1985-10-29 |
| 4489261 | Method and means for feeding electric energy to a portable power tool | C. Sverker M. Hartwig | 1984-12-18 |