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

Patent Owner(s)

Patent Owner	Address
DOWA HOLDINGS CO LTD	4-14-1 SOTOKANDA CHIYODA-KU TOKYO 1010021
AKITA UNIVERSITY	1-1 TEGATA GAKUEN-MACHI AKITA-SHI AKITA 010-8502

International Classification(s)

• C22B:PRODUCTION OR REFINING OF METALS
• C07F:ACYCLIC, CARBOCYCLIC, OR HETEROCYCLIC COMPOUNDS CO....
• B01D:SEPARATION

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Hamada, Fumio	Akita, JP	12	105
Kondo, Yoshihiko	Akita, JP	21	187
Li, Chun-Bin	Akita, JP	2	0

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Maintenance Fees

Fee	Large entity fee	small entity fee	micro entity fee	due date
11.5 Year Payment	$7400.00	$3700.00	$1850.00	Apr 15, 2025

Fee	Large entity fee	small entity fee	micro entity fee
Surcharge - 11.5 year - Late payment within 6 months	$160.00	$80.00	$40.00
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 15, 2013	US,8557020,B2   US8557020B2	GRANTED PATENT AS SECOND PUBLICATION
October 13, 2011	US,20110247459,A1   US20110247459A1	FIRST PUBLISHED PATENT APPLICATION

Full Text

US Patent No: 8557020

Compound, metal extractant, and application of the same

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