Issued Patents 1994
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5354099 | Magnetic metallic safeguarding thread with negative writing | Michael Boehm | 1994-10-11 |
| 5335572 | Method and apparatus for processing sheets of material in register, in particular for making security threads | — | 1994-08-09 |
| 5324079 | Security document having a security thread embedded therein | Wilhelm Ilgmann, Gerhard Schwenk, Gerhard Stenzel | 1994-06-28 |