Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7019953 | Voltage protection circuit | Peter Caldera | 2006-03-28 |
| 5358823 | Radiation-sensitive composition containing esterification product of (1,2-naphthoquinone-2-diazide)-sulfonic acid with 2,3,4,4'-tetrahydroxybenzophenone and a di- or tri-hydroxybenzophenone | Wolfgang Zahn, Hans-Joachim Merrem, Fritz Erdmann | 1994-10-25 |
| 5306595 | Composition containing naphthoquinone diazide sulfonic acid mixed esters and radiation-sensitive recording material prepared therewith | Siegfried Scheler, Wolfgang Zahn, Gerhard Buhr | 1994-04-26 |
| 5268252 | Radiation-sensitive ester and process for its preparation | Siegfried Scheler, Wolfgang Zahn, Gerhard Buhr | 1993-12-07 |
| 4971887 | Positive-working photosensitive mixture and recording material of high thermal stability with phenolic novolak of m-cresol and 2,3,6-trialkylphenol | Wolfgang Zahn, Burkhard Behrens | 1990-11-20 |
| 4765844 | Solvents for photoresist removal | Hans-Joachim Merrem | 1988-08-23 |