Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880575 | Olefinic diphosphonic acids, a process for their production, their use as thresholders and complexing compositions containing them | Siglinde Hemmann | 1989-11-14 |
| 4876339 | Process for synthesis of azacycloalkane-2,2-diphosponic acids | Siglinde Hemmann | 1989-10-24 |