Benzopyrans
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United States of America Patent
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May 2, 1995
Issued Date -
N/A
app pub date -
Sep 13, 1994
filing date -
Mar 12, 1993
priority date (Note) -
Expired
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Abstract
Described are novel reversible photochromic benzopyran compounds, examples of which are compounds substituted at the 2 position of the pyran ring and have fused at the benzo portion of the benzopyran a substituted or unsubstituted heterocyclic ring such as a benzothieno or benzofurano 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 benzopyran compounds or combinations thereof with complementary photochromic compounds, e.g., spiro(indoline) type compounds, are also described.
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