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

Patent Owner(s)

• ASAHI GLASS COMPANY, LIMITED

International Classification(s)

• G02F:DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF ....

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Miyake, Yoshiyuki	Chiyoda-ku , JP	29	312
Murakami, Ryota	Koriyama , JP	20	116
Murakawa, Masahiro	Koriyama , JP	42	398
Nomura, Takuji	Koriyama , JP	65	1028
Ooi, Yoshiharu	Chiyoda-ku , JP	47	1255
Sato, Hiromasa	Koriyama , JP	46	490

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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

DATE PUBLISHED	PUBLICATION/PATENT NO.	PUBLICATION TYPE
July 21, 2009	US,7564504,B2   US7564504B2	GRANTED PATENT AS SECOND PUBLICATION
September 29, 2005	US,20050213212,A1   US20050213212A1	FIRST PUBLISHED PATENT APPLICATION

Full Text

US Patent No: 7564504

Phase plate and an optical data recording/reproducing device

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