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

Patent Owner(s)

Patent Owner	Address
WD MEDIA (SINGAPORE) PTE LTD	C/O WESTERN DIGITAL TECHNOLOGIES INC 20511 LAKE FOREST DRIVE LAKE FOREST CA 92630

International Classification(s)

• G11B:INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BET....

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• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Saito, Chiyo	Tokyo, JP	5	308

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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	Sep 4, 2025

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
March 04, 2014	US,8665541,B2   US8665541B2	GRANTED PATENT AS SECOND PUBLICATION
August 02, 2012	US,20120194936,A1   US20120194936A1	FIRST PUBLISHED PATENT APPLICATION

Full Text

US Patent No: 8665541

Evaluation method of perpendicular magnetic recording medium and manufacturing method of perpendicular magnetic recording medium

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