Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4857797 | Cathode ray tube having a tubular electron gun structure | Gerardus A. H. M. Vrijssen | 1989-08-15 |
| 4827184 | Electron beam device and a focusing lens therefor | Gerardus A. H. M. Vrijssen | 1989-05-02 |