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

Patent Owner(s)

Patent Owner	Address
ZHEJIANG OCEAN UNIVERSITY	316022 NO 1 HAIDA SOUTH ROAD LINCHENG STREET DINGHAI DISTRICT ZHOUSHAN ZHEJIANG ZHOUSHAN CITY ZHEJIANG PROVINCE 316022

International Classification(s)

• G05D:SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC....
• E03F:SEWERS; CESSPOOLS

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
WANG, QIN	Zhoushan, CN	181	661
ZHANG, CHEN	Zhoushan, CN	745	3564
ZHANG, HAI	Zhoushan, CN	53	608
ZHANG, YULIAN	Zhoushan, CN	43	805

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Maintenance Fees

Fee	Large entity fee	small entity fee	micro entity fee	due date
7.5 Year Payment	$3600.00	$1800.00	$900.00	Jul 21, 2028
11.5 Year Payment	$7400.00	$3700.00	$1850.00	Jul 21, 2032

Fee	Large entity fee	small entity fee	micro entity fee
Surcharge - 7.5 year - Late payment within 6 months	$160.00	$80.00	$40.00
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

Full Text

US Patent Application No: 2021/0017,754

RETURN GAS PREVENTION DEVICE FOR DRAINAGE PIPE

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