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

Patent Owner(s)

Patent Owner	Address
CERTEK HEAT MACHINE INC	11101-97 STREET BOX 610 WEMBLEY T0H 3S0

International Classification(s)

• F16L:PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR ....
• F22B:METHODS OF STEAM GENERATION; STEAM BOILERS

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Barendregt, Caleb	Wembley, CA	5	9
Barendregt, Calvin A G	Grand Junction, US	1	1
Barendregt, Jeremy	Grand Prairie, CA	6	10

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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	Mar 9, 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

DATE PUBLISHED	PUBLICATION/PATENT NO.	PUBLICATION TYPE
September 09, 2014	US,8826866,B2   US8826866B2	GRANTED PATENT AS SECOND PUBLICATION
March 15, 2012	US,20120060773,A1   US20120060773A1	FIRST PUBLISHED PATENT APPLICATION

Full Text

US Patent No: 8826866

Dugout heating system

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