Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2002-01-28
2004-10-12
Celsa, Bennett (Department: 1639)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C544S071000
Reexamination Certificate
active
06803471
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to spiropyran compounds. In particular, the invention provides indolinospiropyran compounds and methods for their manufacture, which compounds are useful as photochromic compounds.
BACKGROUND OF THE INVENTION
Various classes of photochromic compounds have been synthesized and suggested for use in applications in which reversible color changes or darkening is induced by sunlight. For example, spiro(indolino)naphthopyrans and spiro(indolino)quinopyrans are described in GB Patent 2,174,711. Spiropyrans also are described in Brown, Glenn H. ed.,
Photochromism
(New York, 1971) and Durr, Heinz and Henri Bouas-Laurent eds.,
Photochromism
(Elsevier, 1990).
Spiropyran derivatives may be the best known organic compounds showing photochromism phenomenon, but the structures of reported spiropyrans are considerably limited. Thus, a need exists both for spiropyran compounds allowing further facile modifications as well as methods for the synthesis of diverse spiropyran compounds.
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Carreira Erick M.
Zhao Weili
Celsa Bennett
Johnson & Johnson Vision Care Inc.
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