Issued Patents 2021
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11011338 | Annular cathode for vacuum tube | François Legrand, Rodolphe Marchesin | 2021-05-18 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11011338 | Annular cathode for vacuum tube | François Legrand, Rodolphe Marchesin | 2021-05-18 |