Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5897746 | Method for equipping papers of value with authenticity features | Thomas Attenberger, Dieter Stein, Gerhard Stenzel | 1999-04-27 |
| 5509691 | Security element in the form of threads or strips to be embedded in security documents and a method for producing and testing the same | Wittich Kaule, Gerhard Schwenk, Gerhard Stenzel | 1996-04-23 |
| 5324079 | Security document having a security thread embedded therein | Wittich Kaule, Gerhard Schwenk, Gerhard Stenzel | 1994-06-28 |
| 5112672 | Security document having an electrically conductive security element embedded therein | Wittich Kaule, Gerhard Schwenk, Gerhard Stenzel | 1992-05-12 |