Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5165063 | Device for measuring distances using an optical element of large chromatic aberration | Hans-Dieter Strater, Daniel Gross | 1992-11-17 |
| 4537504 | Security blank with enhanced authenticating features, and a method and an apparatus for determining the genuineness of the security blank | Heinrich P. Baltes, Andrew Stuart Glass | 1985-08-27 |
| 4504084 | Documents containing information invisible to the naked eye | — | 1985-03-12 |