Inventor
WEIGAND UDO
DE28 patents
⚠️ This page may combine multiple inventors who share the name “WEIGAND UDO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
RODENSTOCK GMBH
14 patentsUS6683709B2Jan 27, 2004
Photochromic pyran compounds
RODENSTOCK GMBH40 citations92
US6660727B1Dec 9, 2003
Photochromic heterocyclically anellated indenochromene compounds
RODENSTOCK GMBH24 citations92
US7459555B2Dec 2, 2008
Photochromic naphthopyrans
RODENSTOCK GMBH8 citations73
US7229989B2Jun 12, 2007
Blue 3H-naphtho[2,1-b]pyran compounds and use thereof in photochromic articles
RODENSTOCK GMBH3 citations62
US6881850B2Apr 19, 2005
Heterocyclically annellated indenochromene derivatives
RODENSTOCK GMBH4 citations62
US7544315B2Jun 9, 2009
Photochromic h-annellated benzo[f]chromene compounds
RODENSTOCK GMBH3 citations61
US6967249B2Nov 22, 2005
Photochromic 3H-naphtho[2,1-b]-pyran compounds and photochromic articles produced therewith
RODENSTOCK GMBH1 citations52
US8013174B2Sep 6, 2011
Photochromic spirodihydrophenanthropyrans
RODENSTOCK GMBH1 citations51
US7922941B2Apr 12, 2011
Photochromic plastic object
RODENSTOCK GMBH0 citations51
US11965102B2Apr 23, 2024
Photochromic annelated naphthopyrane systems with special substituents, for attaining rapid lightening speeds
RODENSTOCK GMBH0 citations50
US10647852B2May 12, 2020
Photochromic multiple ring-fused naphthopyrans having extreme longwave absorption extending far into the visible wavelength range
RODENSTOCK GMBH0 citations41
US7229576B2Jun 12, 2007
Substituted phenanthropyrans
RODENSTOCK GMBH0 citations41
US10077274B2Sep 18, 2018
UV-curing-compatible photochromic fused naphthopyrans
RODENSTOCK GMBH0 citations40
US7892296B2Feb 22, 2011
Photochromic benzopyrans
RODENSTOCK GMBH0 citations40
RODENSTOCK OPTIK G
8 patentsUS6146554ANov 14, 2000
Photochromic naphtopyrane colorants, method for the production and use thereof, photochromic object
RODENSTOCK OPTIK G103 citations97
US6373615B1Apr 16, 2002
Neutral-colored gray photochromic plastic object
RODENSTOCK OPTIK G56 citations96
US6342459B1Jan 29, 2002
Photochromic naphthopyrans
RODENSTOCK OPTIK G22 citations92
US6315928B1Nov 13, 2001
Spirofluorenopyrans
RODENSTOCK OPTIK G36 citations92
US6306316B1Oct 23, 2001
Photochromic plastic object
RODENSTOCK OPTIK G28 citations92
US6225466B1May 1, 2001
Photochromic spirofluorenopyran compounds
RODENSTOCK OPTIK G35 citations92
US6331625B1Dec 18, 2001
Photochromic spirofluorenopyran compounds
RODENSTOCK OPTIK G10 citations73
US6686468B2Feb 3, 2004
H-annellated benzo[f]chromenes
RODENSTOCK OPTIK G6 citations62
MELZIG MANFRED
3 patentsUS8933220B2Jan 13, 2015
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
MELZIG MANFRED2 citations49
US8486312B2Jul 16, 2013
Photochromic naphthopyrans having a double-bridged terphenyl sub-unit
MELZIG MANFRED1 citations49
US8236716B2Aug 7, 2012
Photochromic benzopyrano-benzopyrans with further fusing
MELZIG MANFRED1 citations49