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

Patent Owner(s)

Patent Owner	Address
SHANGHAI BIXIUFU ENTERPRISE MANAGEMENT CO LTD	201112 ROOM 404B BUILDING 10 NO 1188 LIANHANG ROAD MINHANG DISTRICT SHANGHAI SHANGHAI CITY SHANGHAI CITY 201112

International Classification(s)

• F01N:GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHIN....

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• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
DUAN, Zhijun	Shanghai, CN	32	0
TANG, Wanfu	Shanghai, CN	36	0
XI, Yong	Shanghai, CN	49	56
ZOU, Yongan	Shanghai, CN	32	0

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Maintenance Fees

Fee	Large entity fee	small entity fee	micro entity fee	due date
3.5 Year Payment	$1600.00	$800.00	$400.00	Jun 2, 2025
7.5 Year Payment	$3600.00	$1800.00	$900.00	Jun 2, 2029
11.5 Year Payment	$7400.00	$3700.00	$1850.00	Jun 2, 2033

Fee	Large entity fee	small entity fee	micro entity fee
Surcharge - 3.5 year - Late payment within 6 months	$160.00	$80.00	$40.00
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: 2021/0372,306

ENGINE EXHAUST DUST REMOVAL SYSTEM AND METHOD

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