Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8295656 | Method and apparatus for compensating polarization-dependent frequency shifts in optical waveguides | Martin Schell, Norbert Keil, Crispin Zawadzki | 2012-10-23 |
| 6757469 | Temperature insensitive optical waveguide device | Monika Bauer, Jörg Bauer, Jürgen Schneider, Christian Dreyer, Norbert Keil +1 more | 2004-06-29 |
| 6233377 | Digital optical switch | Norbert Keil, Crispin Zawadzki | 2001-05-15 |
| 6215918 | Thermo-optical switch | Norbert Keil, Crispin Zawadzki, Hans-Peter Nolting | 2001-04-10 |