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

Patent Owner(s)

Patent Owner	Address
OPSTOCK INC	4250 TRAIL EAST DRIVE NE ADA MI 49315

International Classification(s)

• 2501:BUILDING MATERIALS

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Clifford, James F	Byron Center, MI	3	72
DeJonge, Mark O	Ada, MI	4	83

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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: D561327

Air grate for raised floors

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