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

Patent Owner(s)

Patent Owner	Address
MHWIRTH AS	POSTBOKS 413 LUNDSIDEN KRISTIANSAND 4604

International Classification(s)

• E21B:EARTH OR ROCK DRILLING

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Anderson, Jaan	Rykkin, NO	1	7
Guesnon, Jean	Chatou, FR	23	452
Luktvasslimo, Oystein	Oslo, NO	1	7
Papon, Gerard	Les Essarts le Roi, FR	14	107
Paulshus, Bjorn	Kjeller, NO	10	58
Persent, Emmanuel	Croissy sur Seine, FR	16	230

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Maintenance Fees

Fee	Large entity fee	small entity fee	micro entity fee	due date
11.5 Year Payment	$7400.00	$3700.00	$1850.00	Nov 27, 2025

Fee	Large entity fee	small entity fee	micro entity fee
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

DATE PUBLISHED	PUBLICATION/PATENT NO.	PUBLICATION TYPE
May 27, 2014	US,8733452,B2   US8733452B2	GRANTED PATENT AS SECOND PUBLICATION
January 24, 2013	US,20130020087,A1   US20130020087A1	FIRST PUBLISHED PATENT APPLICATION

Full Text

US Patent No: 8733452

Riser section connector with flanges and external locking ring

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