Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4842842 | Process for producing .alpha.-form gypsum hemihydrate | — | 1989-06-27 |
| 4802966 | Method for treating liquid used for absorbing gaseous sulfur dioxide in the process for desulfurization of combustion exhaust gas | Haruo Aoki | 1989-02-07 |