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

Patent Owner(s)

• UNION OIL COMPANY OF CALIFORNIA

International Classification(s)

• E21B:EARTH OR ROCK DRILLING

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Dovan, Hoai T	Yorba Linda, CA	26	832
Hutchins, Richard D	Placentia, CA	67	1733
Sandiford, Burton B	Balboa Island, CA	17	597

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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: 5335733

Method for delaying gelation of a gelable polymer composition injected into a subterranean formation

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