Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5024850 | Method of manufacturing a polarization filter and a polarization filter so obtained | Dirk Jan Broer | 1991-06-18 |
| 4983479 | Method of manufacturing a laminated element and the element thus obtained | Dirk Jan Broer, Jan Boven | 1991-01-08 |
| 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 | Dirk J. Gravesteijn, Cornelis J. Schoot | 1988-08-30 |
| 4508811 | Recording element having a pyrylium or thiopyrylium-squarylium dye layer and new pyrylium or thiopyrylium-squarylium compounds | Dirk J. Gravesteijn, Christiaan Steenbergen, Wilhelmus P. M. Nijssen | 1985-04-02 |
| 4298975 | Optical recording medium and method of optically recording information thereon | Petrus J. Kivits, Marinus R. J. de Bont | 1981-11-03 |