Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5004659 | Dye image receiving material | Leon L. Vermeulen, Robert S. Pauwels, Ludovicus H. Vervloet | 1991-04-02 |
| 4908286 | Image-receiving material for use in diffusion transfer reversal | Ludovicus H. Vervloet, Leon L. Vermeulen, Piet Kok | 1990-03-13 |
| 4902593 | Dye image receiving material | Leon L. Vermeulen, Ludovicus H. Vervloet, Piet Kok | 1990-02-20 |
| 4808509 | Diffusion transfer imaging method and receptor sheet for making personal identification documents | Ludovicus H. Vervloet, Leon L. Vermeulen | 1989-02-28 |
| 4772536 | Dye image receiving material | Leon L. Vermeulen, Ludovicus H. Vervloet | 1988-09-20 |
| 4762759 | Image-receiving material with siloxane, colloidal silica and gelatin for silver complex diffusion transfer | Leon L. Vermeulen, Ludovicus H. Vervloet, Piet Kok | 1988-08-09 |
| 4686170 | Photographic silver complex diffusion transfer reversal process under yellow safelight | Leon L. Vermeulen, Theofiel H. Ghys, Ludovicus H. Vervloet, Paul Callant | 1987-08-11 |