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

Patent Owner(s)

Patent Owner	Address
SHELL OIL COMPANY	P O BOX 2463 INTELLECTUAL PROPERTY HOUSTON TX 77252-2463

International Classification(s)

• C21B:MANUFACTURE OF IRON OR STEEL
• B01D:SEPARATION

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Smit, Cornelis Jacobus	Amsterdam, NL	20	268
Van, Der Ploeg Hendrik Jan	Amsterdam, NL	8	127
Van, Heeringen Gijsbert Jan	Amsterdam, NL	13	122
Van, Jarwaarde Ewout Martijn	Amsterdam, NL	3	124

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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

DATE PUBLISHED	PUBLICATION/PATENT NO.	PUBLICATION TYPE
April 26, 2011	US,7931731,B2   US7931731B2	GRANTED PATENT AS SECOND PUBLICATION
March 04, 2010	US,20100050812,A1   US20100050812A1	FIRST PUBLISHED PATENT APPLICATION

Full Text

US Patent No: 7931731

Process for production of elemental iron

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