Issued Patents 1994
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5338642 | Diazo type recording material comprising two couplers wherein the novel coupler used is a bis-malonamide | Toshiharu Tanaka, Sadao Ishige, Takekatsu Sugiyama | 1994-08-16 |