Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6025702 | Signal processing unit for a trolley pole switch controller | John H. Corvin, Charles C. Siegling, III | 2000-02-15 |
| 5740025 | Electronic controller for a trolley pole switch mechanism | Charles C. Siegling, III, John H. Corvin | 1998-04-14 |
| 5691888 | Power controlling unit for a trolley pole switch controller | John H. Corvin, Charles C. Siegling, III | 1997-11-25 |