US Patent No: 5,244,602

Number of patents in Portfolio can not be more than 2000

Photochromic naphthopyrans

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Abstract

Described are novel reversible photochromic naphthopyran compounds substituted on the naphthyl portion at the carbon atom juxtaposed to the oxygen of the pyran ring with, for example, an acetoxy group. Also described are organic host materials that contain or that are coated with such compounds. Articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., spiro(indolino)-oxazine type compounds, are also described.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
PPG INDUSTRIES OHIO, INC.CLEVELAND, OH2210

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Van, Gemert Barry Westmoreland County, PA 48 1039

Cited Art

Patent Info (Count) # Cites Year
 
PPG INDUSTRIES OHIO, INC. (4)
4,637,698 Photochromic compound and articles containing the same 128 1984
4,816,584 Photochromic spiro(indoline)benzoxazines 106 1987
4,931,221 Photochromic spiropyran compounds 46 1988
5,066,818 Photochromic naphthopyran compounds 132 1990
 
AMERICAN OPTICAL CORPORATION (2)
4,215,010 Photochromic compounds 129 1978
4,342,668 Photochromic compounds 129 1980
 
PLESSEY OVERSEAS LIMITED (2)
4,826,977 Photochromic spiropyran compounds 112 1987
4,818,096 Photoreactive lenses with adamantane spiro compounds 110 1987
 
AO, INC. (1)
4,720,356 Photochromic composition resistant to fatigue 139 1987
 
BAYER AKTIENGESELLSCHAFT (1)
4,563,458 Substituted 4-aminomethylene-chromans and -chromenes, processes for their preparation and their use in medicaments 23 1983
 
FIRMENICH SA (1)
5,077,417 Process for the preparation of polycyclic ethers 5 1990
 
MERCK & CO., INC. (1)
4,981,980 Drug for treating manic depression 9 1989
 
RECORDATI S.A. CHEMICAL & PHARMACEUTICAL CO. (1)
4,806,534 Therapeutically active flavonyl-1,4-dihydrophyridines 4 1986
 
YAMAMOTO CHEMICALS, INC. (1)
4,820,840 Process for producing fluorene compounds 3 1988

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
TRANSITIONS OPTICAL, INC. (21)
5,458,814 Substituted naphthopyrans 124 1993
5,429,774 Benzopyran compounds 127 1994
5,514,817 Substituted phenanthropyrans 33 1994
5,458,815 Photochromic naphthopyran compounds 67 1994
5,411,679 Benzopyrans 86 1994
5,585,042 Photochromic naphthopyrans 14 1994
5,552,090 Photochromic naphthopyran compounds 27 1994
5,573,712 Substituted naphthopyrans 29 1995
5,658,500 Substituted naphthopyrans 21 1995
5,658,501 Substituted naphthopyrans 75 1995
5,656,206 Substituted naphthopyrans 18 1995
5,552,091 Benzopyran compounds 31 1995
5,650,098 Substituted naphthopyrans 11 1995
5,645,767 Photochromic indeno-fused naphthopyrans 131 1995
5,651,923 Substituted naphthopyrans 33 1995
5,744,070 Photochromic substituted naphthopyran compounds 6 1995
5,753,146 Photochromic naphthopyran compositions of neutral color 37 1996
5,770,115 Photochromic naphthopyran compositions of improved fatigue resistance 51 1996
5,955,520 Photochromic indeno-fused naphthopyrans 13 1996
5,698,141 Photochromic heterocyclic fused indenonaphthopyrans 67 1997
5,723,072 Photochromic heterocyclic fused indenonaphthopyrans 49 1997
 
INSIGHT EQUITY A.P.X., L.P. (11)
6,337,409 Photochromic naphthopyran compounds 2 1994
5,705,102 Photochromic spironaphthopyran compounds 8 1995
5,531,935 Photochromic naphthopyran compounds 2 1995
5,679,805 Photochromic spironaphthopyran compounds 1 1995
5,702,645 Photochromic chromene derivatives 7 1995
5,658,502 Photochromic articles 20 1995
5,759,450 Photochromic naphthopyran compounds 3 1996
5,869,662 Photochromic benzopyran compounds 3 1997
5,840,926 Photochromic articles 11 1997
6,113,812 Photochromic articles 9 1997
5,847,168 Photochromic compounds 2 1997
 
BAYER CORPORATION (2)
6,107,395 Photochromic polyurethanes 14 1998
6,367,930 Process for preparing a photochromic lens 22 1999
 
CORNING INCORPORATED (2)
6,034,193 Photochromic organic materials 7 1997
6,811,727 Ophthalmic filter materials 2 2002
 
RODENSTOCK GMBH (2)
6,102,543 Photochromically colored object 51 1997
7,544,315 Photochromic h-annellated benzo[f]chromene compounds 1 2007
 
GREAT LAKES CHEMICAL ITALIA S.R.L. (1)
5,543,533 Photochromic products and method for their preparation 7 1994
 
OPTISCHE WERKE G. RODENSTOCK (1)
5,498,686 Optically transparent photochromic plastic material 13 1994
 
PILKINGTON PLC (1)
5,520,853 Photochromic compounds 6 1994
 
PPG INDUSTRIES OHIO, INC. (1)
5,395,567 Photochromic spironaphthopyran compounds 13 1994
 
SDC TECHNOLOGIES, INC. (1)
6,773,108 Lens with photochromic elastomer film and method of making it 1 2001