Inventor
HARA TADASHI
JP15 patents
⚠️ This page may combine multiple inventors who share the name “HARA TADASHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
TOKUYAMA CORP
9 patentsUS5808100ASep 15, 1998
Chromene compounds and photochromic materials
TOKUYAMA CORP34 citations92
US5475074ADec 12, 1995
Polymerizable composition, organic glass and ophthalmic lens
TOKUYAMA CORP42 citations91
US6194511B1Feb 27, 2001
Photochromic curable composition
TOKUYAMA CORP18 citations84
US6362248B1Mar 26, 2002
Photochromic polymerizable composition
TOKUYAMA CORP17 citations83
US6197225B1Mar 6, 2001
Chromene compound
TOKUYAMA CORP16 citations83
US6646104B1Nov 11, 2003
Process for production of sulfur compounds
TOKUYAMA CORP9 citations74
US6528601B1Mar 4, 2003
Polymerizable sulfur-containing (meth) acrylate, polymerizable composition and optical lens
TOKUYAMA CORP9 citations74
US6022496AFeb 8, 2000
Chromene compound
TOKUYAMA CORP9 citations72
US5932725AAug 3, 1999
Chromene compound
TOKUYAMA CORP1 citations50