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

Patent Owner(s)

Patent Owner	Address
KASHIYAMA INDUSTRIES LTD	1-32-3 KOENJI-MINAMI SUGINAMI-KU TOKYO 166-003

International Classification(s)

• F04C:ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DIS....
• F03C:POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Imai, Toshio	Saku, JP	54	303
Itou, Hideaki	Saku, JP	20	98
Misaizu, Masayuki	Saku, JP	1	7

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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
February 17, 2009	US,7491041,B2   US7491041B2	GRANTED PATENT AS SECOND PUBLICATION
March 01, 2007	US,20070048162,A1   US20070048162A1	FIRST PUBLISHED PATENT APPLICATION

Full Text

US Patent No: 7491041

Multistage roots-type vacuum pump

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