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

Patent Owner(s)

Patent Owner	Address
NIPPON STEEL CORPORATION	6-1 MARUNOUCHI 2-CHOME CHIYODA-KU TOKYO 100-8071
NIPPON STEEL ENGINEERING CO LTD	5-1 OSAKI 1-CHOME SHINAGAWA-KU TOKYO 141-8604

International Classification(s)

• C22B:PRODUCTION OR REFINING OF METALS
• C21B:MANUFACTURE OF IRON OR STEEL

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Nakayama, Toshitaka	Kitakyushu, JP	4	8
Shibata, Tomoaki	Tokyo, JP	76	656
Shima, Shinji	Kitakyushu, JP	5	2

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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
November 15, 2011	US,8057736,B2   US8057736B2	GRANTED PATENT AS SECOND PUBLICATION
May 21, 2009	US,20090127754,A1   US20090127754A1	FIRST PUBLISHED PATENT APPLICATION

Full Text

US Patent No: 8057736

Hearth structure of rotary furnace hearth

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