Issued Patents All Time
Showing 26–41 of 41 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6171525 | Process for the production of a photochromic object | Erhard Effer, Herbert Zinner, Herbert Schuster | 2001-01-09 |
| 6146554 | Photochromic naphtopyrane colorants, method for the production and use thereof, photochromic object | Claudia Mann, Udo Weigand | 2000-11-14 |
| 6102543 | Photochromically colored object | — | 2000-08-15 |
| 6036890 | Diaryl-2H-naphthopyrans | Herbert Zinner | 2000-03-14 |
| 5990305 | Photochromic diaryl-3H-naphthopyrane | Herbert Zinner | 1999-11-23 |
| 5952515 | Diaryl-2h-napthopyrans | Herbert Zinner | 1999-09-14 |
| 5801243 | Photochromic compounds (7) | Herbert Zinner | 1998-09-01 |
| 5707557 | Photochromic 3H-naphthopyrans | Herbert Zinner | 1998-01-13 |
| 5645768 | Photochromic compounds | Herbert Zinner | 1997-07-08 |
| 5637709 | Photochromatic substances | — | 1997-06-10 |
| 5608065 | Photochromatic substances | — | 1997-03-04 |
| 5498686 | Optically transparent photochromic plastic material | Erhard Effer, Herbert Schuster, Guiseppe Martinuzzi | 1996-03-12 |
| 5399687 | Photochrome alkyl substituted spiroindoline compounds | — | 1995-03-21 |
| 4959471 | Photochrome spiroindoline-oxazines | — | 1990-09-25 |
| 4927239 | Anti-reflection film for an optical element consisting of an organic material | Horst Rosler, Medardus Schobl | 1990-05-22 |
| 4852974 | Anti-reflection film for an optical element consisting of an organic material | Erhard Effer | 1989-08-01 |