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

Patent Owner(s)

Patent Owner	Address
MINISTERO DELL "UNIVERSITA' E DELLA RICERCA SCIENTIFICA E TENOLOGICA	LUNGOTEVERE THAON DI REVEL 76 ROME

International Classification(s)

• C07D:HETEROCYCLIC COMPOUNDS

• [Classification Symbol]

• [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
Malatesta, Vincenzo	S. Maurizio Al Lambro, IT	13	63
Nodari, Nereo	Mairago, 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: 5532361

Spiro-pyranic compounds endowed with photochromic characteristics

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