Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4767421 | Method of manufacturing a water-insoluble dye layer on a substrate and substrate comprising a dye layer of a cationic dye or an anionic dye ion exchanged with an opposite ion | Jan van der Veen, Dirk J. Gravesteijn | 1988-08-30 |
| 4230939 | Information-recording element having a dye-containing auxiliary layer | Marinus R. J. de Bont, Petrus J. Kivits, Pieter Zalm | 1980-10-28 |