Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4816194 | Method of destroying a brittle body by hydration expansion | Takaaki Katayama, Koretoshi Hitotsuya, Hachiro Kubota | 1989-03-28 |
| 4807530 | Expansive demolition agent | Hachiro Kubota, Toshiharu Hida, Junichiro Migita | 1989-02-28 |