Issued Patents All Time
Showing 1–25 of 41 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8933220 | Photochromic fused naphthopyrans having a benzene ring which is adjacent to the pyran oxygen and is linked to the para substituent via both meta positions | Yven Rohlfing, Udo Weigand | 2015-01-13 |
| 8486312 | Photochromic naphthopyrans having a double-bridged terphenyl sub-unit | Yven Rohlfing, Udo Weigand | 2013-07-16 |
| 8236716 | Photochromic benzopyrano-benzopyrans with further fusing | Yven Rohlfing, Udo Weigand | 2012-08-07 |
| 8013174 | Photochromic spirodihydrophenanthropyrans | Udo Weigand, Yven Rohlfing | 2011-09-06 |
| 7922941 | Photochromic plastic object | Yven Rohlfing, Udo Weigand | 2011-04-12 |
| 7892296 | Photochromic benzopyrans | Yven Rohlfing, Udo Weigand | 2011-02-22 |
| 7544315 | Photochromic h-annellated benzo[f]chromene compounds | Yven Rohlfing, Udo Weigand | 2009-06-09 |
| 7459555 | Photochromic naphthopyrans | Claudia Mann, Udo Weigand | 2008-12-02 |
| 7229576 | Substituted phenanthropyrans | Claudia Mann, Udo Weigand | 2007-06-12 |
| 7229989 | Blue 3H-naphtho[2,1-b]pyran compounds and use thereof in photochromic articles | Claudia Mann, Udo Weigand | 2007-06-12 |
| 6967249 | Photochromic 3H-naphtho[2,1-b]-pyran compounds and photochromic articles produced therewith | Claudia Mann, Udo Weigand | 2005-11-22 |
| 6936725 | Photochromic compounds | Herbert Zinner | 2005-08-30 |
| 6933325 | High index curable photochromic composition and its process | Qiang Zheng, Donald S. Nelson, Jr., Charles William Carper, Jr., Herbert Schuster, Herbert Zinner | 2005-08-23 |
| 6881850 | Heterocyclically annellated indenochromene derivatives | Claudia Mann, Udo Weigand | 2005-04-19 |
| 6853471 | Photochromic synthetic resin object with permanently increased contrast | Hans-Peter Sommer, Michael Voegt, Gerd-Peter Scherg | 2005-02-08 |
| 6686468 | H-annellated benzo[f]chromenes | Claudia Mann, Udo Weigand | 2004-02-03 |
| 6683709 | Photochromic pyran compounds | Claudia Mann, Udo Weigand | 2004-01-27 |
| 6660727 | Photochromic heterocyclically anellated indenochromene compounds | Claudia Mann, Udo Weigand | 2003-12-09 |
| 6373615 | Neutral-colored gray photochromic plastic object | Claudia Mann, Udo Weigand | 2002-04-16 |
| 6342459 | Photochromic naphthopyrans | Claudia Mann, Udo Weigand | 2002-01-29 |
| 6331625 | Photochromic spirofluorenopyran compounds | Claudia Mann, Udo Weigand | 2001-12-18 |
| 6315928 | Spirofluorenopyrans | Claudia Mann, Udo Weigand | 2001-11-13 |
| 6306316 | Photochromic plastic object | Claudia Mann, Udo Weigand | 2001-10-23 |
| 6225466 | Photochromic spirofluorenopyran compounds | Claudia Mann, Udo Weigand | 2001-05-01 |
| 6190580 | Diaryl-2H-naphthopyrans | Herbert Zinner | 2001-02-20 |