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

Patent Owner(s)

Patent Owner	Address
PONY INDUSTRIES INC A CORP OF DE	Not Provided

International Classification(s)

• C09K:MATERIALS FOR APPLICATIONS NOT OTHERWISE PROVIDED ....

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Hale, Arthur H	P.O. Box 370, Sand Springs, OK 74003	54	2377
# of filed Patents : 54 Total Citations : 2377
Rivers, Gordon T	P.O. Box 370, Sand Springs, OK 74003	37	419
# of filed Patents : 37 Total Citations : 419

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Patent Citation Ranking

• 4 Citation Count
• C09K Class

• 0 % this patent is cited more than
• 37 Age

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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: 4721576

Well drilling fluids and process for drilling wells

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Abstract

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The rheological characteristics of aqueous well drilling fluids are improved by incorporating into the fluids a small amount of a sulfonated styrene-itaconic acid copolymer.

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Description

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