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

Patent Owner(s)

Patent Owner	Address
TONEN CHEMICAL CORPORATION	TOKYO

International Classification(s)

• B29C:SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTAN....

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Kamei, Toshikazu	Isehara, JP	9	127
# of filed Patents : 9 Total Citations : 127
Suzuki, Makoto	Yokohama, JP	488	4914
# of filed Patents : 488 Total Citations : 4914
Takeuchi, Hidetoshi	Yokohama, JP	4	82
# of filed Patents : 4 Total Citations : 82

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Patent Citation Ranking

• 8 Citation Count
• B29C Class

• 3.92 % this patent is cited more than
• 28 Age

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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: 5637271

Method of producing non-woven fabrics for use in filters

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Abstract

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A non-woven fabric for filtering medium having graded packing density. The packing density is the lowest at one surface, and gradually increases towards the other surface at which the packing density becomes the greatest. The gradually increasing packing density and the nearly constant increasing rate of the packing density of the non-woven fabric provide a good filtering efficiency and elongate the life time of a filter.

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Description

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Claims

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Legal Events

 

• STCH2018
• FP2001
• LAPS2001
• REMI2001
• I1997
• F1995
• AS1995
• PD1993

Date	Code	Event	Description
Jan 24, 2018	STCH	INFORMATION ON STATUS: PATENT DISCONTINUATION	free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362
Jun 10, 2001	FP	LAPSED DUE TO FAILURE TO PAY MAINTENANCE FEE	Effective Date: Jun 10, 2001
Jun 10, 2001	LAPS	LAPSE FOR FAILURE TO PAY MAINTENANCE FEES
Jan 02, 2001	REMI	MAINTENANCE FEE REMINDER MAILED
Jun 10, 1997	I	Issuance
Sep 11, 1995	F	Filing
Sep 01, 1995	AS	ASSIGNMENT	free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SUZUKI, MAKOTO;TAKEUCHI, HIDETOSHI;KAMEI, TOSHIKAZU;REEL/FRAME:007682/0590 Owner name: TONEN CHEMICAL CORPORATION, JAPAN Effective Date: Sep 01, 1995
Oct 21, 1993	PD	Priority Date