Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5486433 | Button cell | — | 1996-01-23 |
| 5412136 | Process for the preparation of alkyl sulfate powder having a high bulk density | Michael Stehr, Adelbert Otte, Hans-Josef Ratajczak, Klaus Schulze | 1995-05-02 |
| 4897324 | Hermetically-sealed alkaline battery | — | 1990-01-30 |
| 4297632 | Device for monitoring lamp failure in airport navigation lighting | Ludwig Schick | 1981-10-27 |
| 4258108 | Leak-proofing of button cells | — | 1981-03-24 |
| 4242638 | Circuit for monitoring the square of the RMS value of a periodic signal | Ludwig Schick | 1980-12-30 |