Issued Patents All Time
Showing 26–29 of 29 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8746555 | Method of marking a document or item; method and device for identifying the marked document or item; use of circular polarizing particles | Andrea Callegari | 2014-06-10 |
| 8672218 | Method of marking a document or item; method and device for identifyng the marked document or item; use of circular polarizing particles | Andrea Callegari | 2014-03-18 |
| 8467038 | Method and device for measuring optical properties of an optically variable marking applied to an object | Xavier Schwab | 2013-06-18 |
| 8186573 | Method of marking a document or item; method and device for identifying the marked document or item; use of circular polarizing particles | Andrea Callegari | 2012-05-29 |