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• 15 United States
• 10 France
• 8 Japan
• 7 China
• 5 Korea
• 2 Other

Patent Owner(s)

Patent Owner	Address
TRANSITIONS OPTICAL INC	PINELLAS PARK FL

International Classification(s)

• C07D:HETEROCYCLIC COMPOUNDS

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Chopra, Anu	County of Allegheny, US	40	1055
Kumar, Anil	County of Allegheny, US	432	6753
Nelson, Clara E	County of Allegheny, US	5	205
Walters, Robert W	County of Westmoreland, US	59	3938

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Maintenance Fees

Fee	Large entity fee	small entity fee	micro entity fee	due date

Fee	Large entity fee	small entity fee	micro entity fee
Surcharge after expiration - Late payment is unavoidable	$700.00	$350.00	$175.00
Surcharge after expiration - Late payment is unintentional	$1,640.00	$820.00	$410.00

DATE PUBLISHED	PUBLICATION/PATENT NO.	PUBLICATION TYPE
April 14, 2009	US,7517982,B2   US7517982B2	GRANTED PATENT AS SECOND PUBLICATION
July 05, 2007	US,20070155964,A1   US20070155964A1	FIRST PUBLISHED PATENT APPLICATION

Full Text

US Patent No: 7517982

Naphthols useful for preparing indeno-fused photochromic naphthopyrans

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