3,6-bis-(2'-methoxyphenyl)-2,5-dihydro-2,5-dimethyl-pyrrolo-(3,4-c)-pyrrole-1,4-dione compound
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United States of America Patent
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Oct 11, 1994
Grant Date -
N/A
app pub date -
Jan 29, 1991
filing date -
Jul 29, 1988
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Expired
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Abstract
A compound that is 3,6-Bis-(2'-methoxyphenyl)-2,5-dihydro-2, 5-dimethyl-pyrrolo-(3,4-c)-pyrrole-1,4-dione for the formula III ##STR1## ##STR2## present invention relates to the use of substances, in particular dyes, having at least two differently colored forms as storage media in optical memories. The invention furthermore relates to optical memories which as the storage media contains a substance, in particular a dye, having at least two differently colored forms, and to a process for loading, reading and erasing these memories and to particularly suitable dyes for use in optical memories and to processes for the preparation of these dyes.
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