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

Patent Owner(s)

Patent Owner	Address
KYOWA HAKKO KIRIN CO LTD	TOKYO JAPAN TOKYO METROPOLIS

International Classification(s)

• A61K:PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOS....
• C07J:STEROIDS

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Akinaga, Shiro	Shizuoka, JP	52	378
Amishiro, Nobuyoshi	Shizuoka, JP	14	156
Ino, Yoji	Shizuoka, JP	16	81
Ishida, Hiroyuki	Shizuoka, JP	171	2463
Li, Pui-Kai	Galloway, OH	26	306
Murakata, Chikara	Shizuoka, JP	51	588
Nakata, Taisuke	Shizuoka, JP	3	0

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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
October 28, 2003	US,6638923,B2   US6638923B2	GRANTED PATENT AS SECOND PUBLICATION
May 16, 2002	US,20020058651,A1   US20020058651A1	FIRST PUBLISHED PATENT APPLICATION

Full Text

US Patent No: 6638923

Estra-1,3,5(10),16-tetraene derivatives

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