Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5084434 | Ink and method for the development of concealed iamges | — | 1992-01-28 |
| 5017226 | Ink and method for the development of concealed images | — | 1991-05-21 |
| 4925761 | Conversion solutions for lithographic printing plates containing phytic acid | Robert N. Cooper | 1990-05-15 |