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

Patent Owner(s)

Patent Owner	Address
MCDERMOTT INCORPORATED NEW ORLEANS LA A CORP OF DE	LA

International Classification(s)

• E21D:SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAM....
• E21B:EARTH OR ROCK DRILLING

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Calkins, Dennis E	Metairie, LA	7	36
Gray, Daniel W	New Orleans, LA	4	44
Green, William L	New Orleans, LA	3	18
Landers, Jr Edward A	Covington, LA	1	0

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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

Full Text

US Patent No: 4397582

Method of creating a cold water conduit to be used in ocean thermal energy conversion systems

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