Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4834960 | Process for purifying phosphorous acid | Jurgen Grosse, Bernhard Hofmann | 1989-05-30 |
| 4806324 | Process for making phosphoric acid free from titanium | Reinhard Gradl, Klaus Schrodter | 1989-02-21 |