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

Patent Owner(s)

• THATCHER COMPANY, INC.

International Classification(s)

• B03D:FLOTATION; DIFFERENTIAL SEDIMENTATION
• C02F:TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE....
• B01D:SEPARATION

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Ross, Mark A	Salt Lake City, US	36	1107
Zidek, Jeffrey W	Salt Lake City, US	4	14

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Maintenance Fees

Fee	Large entity fee	small entity fee	micro entity fee	due date
7.5 Year Payment	$3600.00	$1800.00	$900.00	May 22, 2024
11.5 Year Payment	$7400.00	$3700.00	$1850.00	May 22, 2028

Fee	Large entity fee	small entity fee	micro entity fee
Surcharge - 7.5 year - Late payment within 6 months	$160.00	$80.00	$40.00
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

DATE PUBLISHED	PUBLICATION/PATENT NO.	PUBLICATION TYPE
November 22, 2016	US,9499420,B2   US9499420B2	GRANTED PATENT AS SECOND PUBLICATION
May 08, 2014	US,20140124447,A1   US20140124447A1	FIRST PUBLISHED PATENT APPLICATION

Full Text

US Patent No: 9499420

Formulations and methods for removing heavy metals from waste solutions containing chelating agents

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