Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877996 | Electron tube with control electrode remote from anode | Jozephus J. M. Warringa | 1989-10-31 |
DH
Dirk Van Houwelingen
Overall (1989): #120,119 of 140,708Top 90%
1
Patents 1989