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

Patent Owner(s)

Patent Owner	Address
SF DIAMOND CO LTD	450000 NO 109 10TH STREET ZHENGZHOU AREA (JINGKAI) ZHENGZHOU PILOT FREE TRADE ZONE HENAN PROVINCE ZHENGZHOU CITY HENAN PROVINCE 450000

International Classification(s)

• 1509:MACHINE TOOLS, ABRADING AND FOUNDING MACHINERY

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Du, Weifeng	Zhengzhou, CN	19	97
Fang, Haijiang	Zhengzhou, CN	19	108
Wang, Yongfeng	Zhengzhou, CN	43	374
Yang, Jian	Zhengzhou, CN	606	6431

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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	Feb 28, 2027
7.5 Year Payment	$3600.00	$1800.00	$900.00	Feb 28, 2031
11.5 Year Payment	$7400.00	$3700.00	$1850.00	Feb 28, 2035

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 No: D997219

Polycrystalline diamond compact with a double-layer structure

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