Issued Patents All Time
Showing 1–18 of 18 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12111519 | Eyeglass lens, use of an eyeglass lens, and process for manufacturing an eyeglass lens | Michael Voegt, Andrea Welk, Hans-Peter Sommer | 2024-10-08 |
| 11965102 | Photochromic annelated naphthopyrane systems with special substituents, for attaining rapid lightening speeds | Udo Weigand, Yven Rohlfing | 2024-04-23 |
| 10647852 | Photochromic multiple ring-fused naphthopyrans having extreme longwave absorption extending far into the visible wavelength range | Udo Weigand | 2020-05-12 |
| 10274749 | Producing microstructured spectacle lenses by means of transfer layer | Stephan Trumm, Karl Huber, Ferdinand Schreder, Erich Koell, Herbert Schuster +2 more | 2019-04-30 |
| 10077274 | UV-curing-compatible photochromic fused naphthopyrans | Udo Weigand, Yven Rohlfing | 2018-09-18 |
| 9963574 | Photochromic fluorenopyrans with defined dibenzo[B,D]pyrano fused attachment | Udo Weigand, Yven Rohlfing | 2018-05-08 |
| 9151872 | Photochromic double-fused naphthopyrans | Udo Weigand, Yven Rohlfing | 2015-10-06 |
| 8987477 | Photochromic bis-idenofused naphthopryans | Udo Weigand, Yven Rohlfing | 2015-03-24 |
| 6936725 | Photochromic compounds | Manfred Melzig | 2005-08-30 |
| 6933325 | High index curable photochromic composition and its process | Qiang Zheng, Donald S. Nelson, Jr., Charles William Carper, Jr., Manfred Melzig, Herbert Schuster | 2005-08-23 |
| 6190580 | Diaryl-2H-naphthopyrans | Manfred Melzig | 2001-02-20 |
| 6171525 | Process for the production of a photochromic object | Erhard Effer, Manfred Melzig, Herbert Schuster | 2001-01-09 |
| 6036890 | Diaryl-2H-naphthopyrans | Manfred Melzig | 2000-03-14 |
| 5990305 | Photochromic diaryl-3H-naphthopyrane | Manfred Melzig | 1999-11-23 |
| 5952515 | Diaryl-2h-napthopyrans | Manfred Melzig | 1999-09-14 |
| 5801243 | Photochromic compounds (7) | Manfred Melzig | 1998-09-01 |
| 5707557 | Photochromic 3H-naphthopyrans | Manfred Melzig | 1998-01-13 |
| 5645768 | Photochromic compounds | Manfred Melzig | 1997-07-08 |