Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882617 | Projection device and associated electro-optic monochrome display device with phosphor layer and interference filters | — | 1989-11-21 |
| 4822144 | Electro-optic color display including luminescent layer and interference filter | — | 1989-04-18 |
| 4807014 | Three tube color projection television system having multispot blue tube and single-spot red and green tubes | Aart A. Van Gorkum, Arne L. Duwaer, Johannes H. M. Spruit, Alexander R. H. Van Schoonhoven | 1989-02-21 |
| 4804884 | Display tube having improved brightness distribution | Johannes H. M. Spruit, John A. Clarke | 1989-02-14 |