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Nelson; Clara E.
Allegheny County, PA
No. of patents:

Patent Number Title Of Patent Date Issued
7320826 Photochromic articles with reduced temperature dependency and methods for preparation January 22, 2008
Described are photochromic articles that include a substrate, a temperature dependent reducing amount of at least one organic photochromic material (b) that changes from more absorbing to less absorbing of radiation in its activating spectral absorbance as the temperature increases f
7166357 Photochromic articles that activate behind ultraviolet radiation blocking transparencies and met January 23, 2007
Described are photochromic articles that include a substrate and a photochromic amount of at least one organic photochromic material (b) represented by graphic formula XIII adapted to change from an unactivated state to an activated state by exposure to radiation substantially in a w

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