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

Patent Owner(s)

Patent Owner	Address
DOW CHEMICAL COMPANY THE 2030 DOW CENTER ABBOTT RD MIDLAND MI 48640 A CORP OF DE	DE

International Classification(s)

• B01D:SEPARATION

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Beck, Henry N	Walnut Creek, CA	19	473
Lundgard, Richard A	Antioch, CA	29	593
Mahoney, Robert D	Danville, CA	15	409
Wan, Hawk S	Antioch, CA	6	193

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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: 5015275

Isotropic microporous syndiotactic polystyrene membranes and processes for preparing the same

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