Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4997805 | Heat sensitive recording material containing chromogenic dicyanomethylenepyrazolinones | Hans Junek | 1991-03-05 |
| 4950754 | Chromogenic dicyanomethylenepyrazolinones | Hans Junek | 1990-08-21 |
| 4916234 | Chromogenic dicyanomethylenepyrazolinones | Hans Junek | 1990-04-10 |