Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4855211 | Polymeric phosphonium mordant and photographic element containing the same | Wilhelmus Janssens, Daniel M. Timmerman | 1989-08-08 |
| 4820608 | Dye diffusion transfer imaging process and image receptor used therein | Daniel M. Timmerman, Antonius A. Rutges, Eddy Michiels, Luc Vanmaele, Piet Kok | 1989-04-11 |