Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859565 | Diffusion transfer reversal process | Rene De Keyzer, Robert J. Pollet | 1989-08-22 |
| 4808509 | Diffusion transfer imaging method and receptor sheet for making personal identification documents | Ludovicus H. Vervloet, Willy P. De Smedt | 1989-02-28 |