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

Patent Owner(s)

Patent Owner	Address
ENI S P A	PIAZZALE ENRICO MATTEI 1 ROMA 00144

International Classification(s)

• E21B:EARTH OR ROCK DRILLING

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• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
CALDERONI, Angelo	San Donato Milanese-Milan, IT	19	140
ZAUSA, Fabrizio	Calvignasco-Milan, IT	7	156

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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	May 27, 2026

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

Full Text

US Patent Application No: 2014/0345,854

METHOD FOR MAKING CENTRALIZERS FOR CENTRALISING A TIGHT FITTING CASING IN A BOREHOLE

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