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

Patent Owner(s)

Patent Owner	Address
NATIONAL TAX ADMINISTRATION AGENCY	1-GO 1-BAN 3-CHOME KASUMIGASEKI CHIYODA-KU TOKYO
TOHO ZINC COMPANY LIMITED	2-GO 12-BAN 3-CHOME NIHONBASHI CHUO-KU TOKYO

International Classification(s)

• C02F:TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE....

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Koizumi, Takeo	Yokohama, JP	5	81
Mitsutomi, Katsuyoshi	Ushiku, JP	2	41
Nakamura, Seiji	Kashiwa, JP	62	1021
Nojiro, Kikuo	Machida, JP	5	54
Otsuka, Kenichi	Higashiooizumi, JP	38	403
Yoshizawa, Kiyoshi	Tokyo, JP	9	80

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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: 4371440

Method of treating a waste water rich in protein

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