Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4842629 | Method for producing buried regions of raised refractive index in a glass member by ion exchange | Herbert Michel, Christoph Thoma | 1989-06-27 |
| 4836899 | Method for field-assisted ion exchange with anodic and cathodic contacting | — | 1989-06-06 |