Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859251 | Furnace for formation of black oxide film on the surface of thin metal sheet and method for formation of black oxide film on the surface of shadow mask material by use of said furnace | Humio Shibata, Katsumi Iguchi, Hisao Inoue, Takashi Ono, Takashi Ishimoto | 1989-08-22 |