Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5302572 | Multilayer image receiving material for thermal dye transfer and process for producing same | Wieland Sack, Dieter Becker, Jurgen Graumann, Manuela Hesse | 1994-04-12 |
| 4952486 | Support material for thermally developable photographic layers | Wieland Sack | 1990-08-28 |
| 4844777 | Water-resistant photographic paper support | Ferenc Kertesz, Wieland Sack | 1989-07-04 |
| 4731285 | Water-resistant photographic paper support | — | 1988-03-15 |
| 4729945 | Multilayer photographic support material | Wieland Sack | 1988-03-08 |
| 4665013 | Photographic support materials containing coated pigment | Wieland Sack | 1987-05-12 |
| 4663236 | Coated photographic base material | Ferencz Kertesz, Heinz Trentmann, Wieland Sack | 1987-05-05 |
| 4645736 | Waterproof photographic paper support | Wieland Sack, Heinz Trentmann, Hans-Georg Wollmer | 1987-02-24 |
| 4364971 | Waterproof photographic paper and method of producing same | Wieland Sack, Ferenc Kertesz | 1982-12-21 |
| 4352861 | Photographic paper base with improved durability | Walter von Meer, Uwe Jensen | 1982-10-05 |
| 4309486 | Electrostatic recording material | Wieland Sack, Ferencz Kertesz | 1982-01-05 |