Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6954293 | Data carrier having an optically variable element and methods for producing it | Wittich Kaule, Gerhard Stenzel | 2005-10-11 |
| 6337752 | Data carrier having an optically variable element and methods for producing it | Wittich Kaule, Gerhard Stenzel | 2002-01-08 |
| 5801857 | Data carrier having an optically variable element and methods for producing it | Wittich Kaule, Gerhard Stenzel | 1998-09-01 |
| 5433807 | Method of producing a document with an unforgeable surface relief | Gerhard Stenzel, Wittich Kaule | 1995-07-18 |
| 4988126 | Document with an unforgeable surface | Gerhard Stenzel, Wittich Kaule | 1991-01-29 |