Photochromic compound and articles containing the same

United States of America Patent

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Jun 5, 1990
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N/A
app pub date
Jun 12, 1989
filing date
Jul 27, 1987

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Expired

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Abstract

Described are spiro (benzidoline) pyrido benzoxazine and spiro (benzindoline) naphthoxazine photochromic compounds and their use in plastic hosts to impact a photochromic response thereto.

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Patent Owner	Address
PPG INDUSTRIES INC	PENNSYLVANIA USA PENNSYLVANIA

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G02B:OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS

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[Patents Count]

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Inventor Name	Address	# of filed Patents	Total Citations
Kwak, Won S	Akron, OH	7	511
Kwiatkowski, Patricia L	Akron, OH	8	334

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Photochromic compound and articles containing the same

Number of patents in Portfolio can not be more than 2000

United States of America Patent

07366230

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PATENT NO	4931219
SERIAL NO	07366230
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07366230

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