Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10932967 | Personal assistive lift device and related methods | Helmut Koch | 2021-03-02 |
| 4232199 | Special services add-on for dial pulse activated telephone switching office | John T. Boatwright, David PRINCE, Helmut Koch | 1980-11-04 |