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

Patent Owner(s)

Patent Owner	Address
VOLK OPTICAL INC	7893 ENTERPRISE DRIVE MENTOR OH 44060

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Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Volk, Donald A	7893 Enterprise Dr., Mentor, OH 44060	37	1128

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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: D357319

Indirect ophthalmoscopy lens retaining ring

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