Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6491221 | Security documents | David Arnold, Michael D. Crossfield | 2002-12-10 |
| 5008687 | Data storage medium | Robert Longman, Peter R. Helfet | 1991-04-16 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6491221 | Security documents | David Arnold, Michael D. Crossfield | 2002-12-10 |
| 5008687 | Data storage medium | Robert Longman, Peter R. Helfet | 1991-04-16 |