Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888248 | Colloidal metal dispersion, and a colloidal metal complex | Hidefumi Hirai, Michitaka Otaki | 1989-12-19 |
| 4864071 | Process for separation of unsaturated hydrocarbon from gas mixture | Hidefumi Hirai, Susumu Hara | 1989-09-05 |