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

Patent Owner(s)

Patent Owner	Address
ENICHEM SYNTHESIS S P A	90139 PALERMO

International Classification(s)

• C07D:HETEROCYCLIC COMPOUNDS
• G02B:OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
• G02F:DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF ....

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• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Allegrini, Pietro	San Donato Milanese, IT	114	341
Crisci, Luciana	Graffignana, IT	12	110
Nodari, Nereo	Pantigliate, IT	12	86

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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

Full Text

US Patent No: 5730908

Photochromatic and thermochromatic compounds and their application in polymeric materials

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