Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873169 | Process for the preparation of an o-naphthoquinonediazide sulfonic acid ester and photosensitive mixture containing same | Fritz Erdmann, Horst-Dieter Thamm | 1989-10-10 |