Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4555475 | Method of making a planographic printing member with aluminium silicate | Phillip R. Kellner | 1985-11-26 |
| 4528909 | Printing members | Anthony W. Rigg, Phillip R. Kellner, Mohammed A. Sahi | 1985-07-16 |
| 4451552 | Formation of print surfaces | Phillip R. Kellner | 1984-05-29 |