Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5656389 | Electrochemical cell | Karl-Heinz Tetzlaff, Rüdiger Walz | 1997-08-12 |
FH
Freddy Helmer-Metzmann
Overall (1997): #152,561 of 185,788Top 85%
1
Patents 1997