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

Patent Owner(s)

Patent Owner	Address
SUZHOU SPRING-SEA BIO-PHARMACEUTICALS CO LTD	LECHENG SQUARE BUILDING 5-E490 BIOBAY #218 SANGTIAN ST SINGAPORE INDUSTRY PARK JIANGSU SUZHOU 215123

International Classification(s)

• C07H:SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTI....
• A61K:PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOS....
• A61P:THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDI....

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
XIE, Yan	Suzhou, CN	97	154
XU, Kai	Suzhou, CN	744	4482
ZHAO, Zuchun	Suzhou, CN	53	680

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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	Jul 30, 2028
7.5 Year Payment	$3600.00	$1800.00	$900.00	Jul 30, 2032
11.5 Year Payment	$7400.00	$3700.00	$1850.00	Jul 30, 2036

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: 2025/0034,196

ESTER DERIVATIVES OF N4-HYDROXYCYTIDINE AND USE THEREOF

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