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filingDate 2000-06-08-04:00^^<http://www.w3.org/2001/XMLSchema#date>
grantDate 2002-07-30-04:00^^<http://www.w3.org/2001/XMLSchema#date>
inventor http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ebf732519c09494ac3cd1b20d03e1220
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a92b7789a4086999f4cbe8fcab41878b
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publicationDate 2002-07-30-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber US-6426023-B1
titleOfInvention Benzopyrans annelated in C7-C8 with an aromatic heterocycle and compositions and (CO)polymer matrices containing them
abstract The invention relates to novel benzopyran-type compounds having an aromatic heterocycle annelated in position 7,8 and a carbocycle annelated in position 5,6. These compounds have the formula (I) given below:These compounds (I) have interesting photochromic properties. The invention also relates to their preparation, to their applications as photochromes, as well as to the compositions and (co)polymer matrices containing them.
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