US Patent No: 5,186,867

Number of patents in Portfolio can not be more than 2000

Spiro-indoline oxazine compounds with photochromatic and photosensitizing characteristics and the process for their preparation

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

Loading Importance Indicators... loading....

Abstract

See full text

New compounds of the spiro-indoline-oxazine class possessing photochromatic and photosensitizing charecteristics are definable by the general formula (I): ##STR1## where the substituents R, R.sup.1 -R.sup.7 and A are as defined in the description. The process for preparing the compounds (I) is described, as is their use as photochromic agents able to confer photochromatic characteristics on the articles in which they are incorporated, and as photosensitizing agents.

Loading the Abstract Image... loading....

First Claim

See full text

all claims..

Related Publications

Loading Related Publications... loading....

Patent Owner(s)

Patent OwnerAddressTotal Patents
ENICHEM SYNTHESIS S.P.A.PALERMO142
GREAT LAKES CHEMICAL (EUROPE) GMBHFRAUENFELD18

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Allegrini, Pietro San Donato Milanese, IT 133 128
Castaldi, Graziano Briona, IT 101 162
Crisci, Luciana Graffignana, IT 13 57
Renzi, Fiorenzo Gorgonzola, IT 25 93

Cited Art Landscape

Patent Info (Count) # Cites Year
 
PPG INDUSTRIES, INC. (4)
4,785,097 Method for synthesizing spiro-oxazines 13 1986
4,792,224 Photochromic compound and articles containing the same 33 1987
4,968,454 Variable-light transmittance article and method for preparing same 86 1988
4,931,219 Photochromic compound and articles containing the same 74 1989
 
PPG INDUSTRIES OHIO, INC. (2)
4,816,584 Photochromic spiro(indoline)benzoxazines 112 1987
5,021,196 Method for preparing variable-light transmittance article 14 1990
 
AO, INC. (1)
4,367,170 Stabilized photochromic materials 98 1975
 
NISSAN MOTOR CO., LTD. (1)
4,962,013 Photochromic material containing a spirooxazine and a nitroxy free radical triplet state quencher 15 1988
 
PILKINGTON PLC (1)
4,913,544 Photochromic articles 106 1987
 
TORAY INDUSTRIES, INC. (1)
4,784,474 Spiro-oxazine compounds and preparation thereof and photochromic shaped article 8 1987

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
TRANSITIONS OPTICAL, INC. (6)
6,136,968 Homoazaadamantane spirooxazines and their use in the field of ophthalmic optics 30 1999
8,211,338 Photochromic compounds 1 2008
8,545,984 Photochromic compounds and compositions 0 2010
8,518,546 Photochromic compounds and compositions 0 2010
8,698,117 Indeno-fused ring compounds 0 2011
8,705,160 Photochromic compounds 0 2012
 
YEDA RESEARCH AND DEVELOPMENT CO. LTD. (2)
5,473,068 Photochromic spirooxazine monomers and polysiloxanes 6 1994
6,891,038 Photochromic spiro(indoline)naphthoxazines 6 2001
 
ESSILOR INTERNATIONAL COMPAGNIE GENERALE D'OPTIQUE (1)
5,831,090 Process for the preparation of photochromic compounds of the annelated spiro?indoline?2,3'! benzoxazine!type 5 1997
 
GREAT LAKES CHEMICAL (EUROPE) GMBH (1)
7,262,294 Photochromatic pyrano-1,3-oxazinonaphthalene derivatives 0 2001

Full Text

 
loading....