Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4870260 | Method and apparatus for validating valuable documents | Andrzej Niepolomski | 1989-09-26 |
| 4662653 | Optically diffracting security element | — | 1987-05-05 |
| 4376887 | Device for the thermal erasure of mechanically readable optical markings | Joseph A. Clarinval, Alex Nyfeler | 1983-03-15 |
| 4297001 | Projection screen and method for making same | Gregor Antes | 1981-10-27 |
| 4250393 | Photoelectric apparatus for detecting altered markings | — | 1981-02-10 |
| 4250217 | Documents embossed with machine-readable information by means of an embossing foil | — | 1981-02-10 |
| 4223050 | Process for embossing a relief pattern into a thermoplastic information carrier | Alex Nyfeler | 1980-09-16 |
| 4211918 | Method and device for identifying documents | Alex Nyfeler, Heinz Lienhard | 1980-07-08 |
| 4184700 | Documents embossed with optical markings representing genuineness information | — | 1980-01-22 |