Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5122187 | Hot melt ink compositions | William M. Schwarz, Robert H. Marchessault, Lupu Alexandru | 1992-06-16 |
| 5006170 | Hot melt ink compositions | William M. Schwarz, Robert H. Marchessault, Lupu Alexandru | 1991-04-09 |