Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5318640 | Surface treatment method and composition for zinc coated steel sheet | Hitoshii Ishii, Kazuhiko Mori, Toshi Miyawaki | 1994-06-07 |
| 4931317 | Composition and process for the formation of a black coating on surfaces of materials | Soei Koizumi | 1990-06-05 |