Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4814515 | Method of manufacturing a modified polyhydroxy compound | Satomi Tada, Hirokazu Wakabayashi | 1989-03-21 |
| 4810298 | Manufacturing method of asphalt foam | Koretoshi Katsuki | 1989-03-07 |