Composition for a light filtering material
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United States of America Patent
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Jan 27, 2009
Grant Date -
Sep 16, 2004
app pub date -
Mar 14, 2003
filing date -
Mar 14, 2003
priority date (Note) -
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Abstract
A composition for a filter material includes a dye and possibly a polymer host. The dye includes a Co(II) compound, a Ni(II) compound or a mixture thereof. Filter material can have a transmittance at 500 nanometers of at least 80% and a steep cutoff absorption band with a transmittance between 600 and 700 nanometers of no more than 10%.
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