Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5317230 | Amplifier valve with grid having rods of variable width | Jean-Pierre Buge | 1994-05-31 |
| 5225735 | Electron tube with cylindrical hexagonal grid aligned with rhombus shaped cathode wires | — | 1993-07-06 |