Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11794872 | Electrical power system for a watercraft | Timothy MacDonald, Stephen I. Callis | 2023-10-24 |
| 10669001 | Hybrid electrical and mechanical propulsion and energy system for a ship | Douglas C. Folts, Bruce Gamble, Stephen I. Callis | 2020-06-02 |