Inventor
HEYWANG ULRICH
DE23 patents
⚠️ This page may combine multiple inventors who share the name “HEYWANG ULRICH”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
MERCK PATENT GMBH
22 patentsUS5705169AJan 6, 1998
Ketotricyclo .5.2.1.0! decane derivatives
MERCK PATENT GMBH184 citations98
US5730960AMar 24, 1998
Benzylidenenorcamphor derivatives
MERCK PATENT GMBH188 citations97
US7211302B2May 1, 2007
Photostable liquid crystalline medium
MERCK PATENT GMBH23 citations93
US5520906AMay 28, 1996
Triazine derivatives with UV filter properties
MERCK PATENT GMBH21 citations92
US5501850AMar 26, 1996
Use of benzimidazole derivatives as light protection filters
MERCK PATENT GMBH28 citations89
US6440401B1Aug 27, 2002
2-phenyl-benzimidazolesulfonic acids as UV-B filters
MERCK PATENT GMBH15 citations84
US5718906AFeb 17, 1998
Light-stable cosmetic composition
MERCK PATENT GMBH17 citations83
US7678431B2Mar 16, 2010
Photostable liquid-crystalline medium
MERCK PATENT GMBH6 citations74
US6593476B2Jul 15, 2003
Process for the preparation of UV filter substances
MERCK PATENT GMBH7 citations73
US5144081ASep 1, 1992
Dialkoxybenzylidene-camphor derivatives
MERCK PATENT GMBH16 citations73
US5817862AOct 6, 1998
Process for the preparation of cinnamic acid derivatives
MERCK PATENT GMBH12 citations70
US5473079ADec 5, 1995
Process for preparing 2-arylbenzimidazole-5-sulfonic acids
MERCK PATENT GMBH13 citations70
US5639883AJun 17, 1997
Process for preparing substituted 4-methylidenecinnamic acid derivatives
MERCK PATENT GMBH2 citations62
US6140507AOct 31, 2000
Method for debenzylation of dibenzylbiotin
MERCK PATENT GMBH2 citations61
US5677314AOct 14, 1997
Bis(methylidene)phenylene derivatives
MERCK PATENT GMBH5 citations61
US5399563AMar 21, 1995
Benzylidenequinuclidinones
MERCK PATENT GMBH3 citations59
US5180837AJan 19, 1993
Pilosinine derivatives
MERCK PATENT GMBH1 citations52
US6277357B1Aug 21, 2001
Ketotricyclo[5.2.1.0]decane derivatives
MERCK PATENT GMBH0 citations51
US5968482AOct 19, 1999
α-hydroxyketoalkyl derivatives as light protection filters
MERCK PATENT GMBH1 citations51
US5628988AMay 13, 1997
Ketotricyclo[5.2.1.0]decane derivatives
MERCK PATENT GMBH0 citations51
US5275941AJan 4, 1994
Process for the preparation of N-protected dialkyl (2S,3S)-3-ethylaspartates
MERCK PATENT GMBH1 citations51
US5714629AFeb 3, 1998
Process for the preparation of thioglycolic acid alkyl esters
MERCK PATENT GMBH1 citations43