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

Patent Owner(s)

Patent Owner	Address
DAEWOO ENGINEERING AND CONSTRUCTION CORPORATION	541 NAMDAERMUNNO 5-GA CHUNG-GU SEOUL

International Classification(s)

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

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• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Chang, Yun Seok	Suwon, KR	3	3
Heo, Yong Rok	Seoul, KR	1	2
Lee, Eui Shin	Suwon, KR	1	2
Park, Chil Lim	Seongnam, KR	1	2
Park, Myung Gyun	Suwon, KR	1	2

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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: 6177007

High efficiency apparatus for treating nitrogen and phosphorous contained in sewage

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