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

Patent Owner(s)

• HALLIBURTON ENERGY SERVICES, INC.

International Classification(s)

• E21B:EARTH OR ROCK DRILLING

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Cook, Robert Lance	Katy, TX	134	4674
Ring, Lev	Houston, TX	188	5787
Stewart, R Bruce	The Hague, NL	47	1819

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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
May 25, 2004	US,6739392,B2   US6739392B2	GRANTED PATENT AS SECOND PUBLICATION
May 23, 2002	US,20020060069,A1   US20020060069A1	FIRST PUBLISHED PATENT APPLICATION

Full Text

US Patent No: 6739392

Forming a wellbore casing while simultaneously drilling a wellbore

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