Issued Patents All Time
Showing 51–53 of 53 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5385803 | Authentication process | James M. Duff, David L. Hecht | 1995-01-31 |
| 5308363 | Process for quaternary ammonium bisulfates | George Liebermann, John L. Haack, John Abate | 1994-05-03 |
| 5208630 | Process for the authentication of documents utilizing encapsulated toners | James M. Duff, Raymond W. Wong | 1993-05-04 |