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

Patent Owner(s)

Patent Owner	Address
SEIKOSHA CO LTD	CHUO-KU TOKYO

International Classification(s)

• Non-US Classification not provided for expired patents

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Ishizaki, Ryuhei	Tokyo, JP	2	4
# of filed Patents : 2 Total Citations : 4

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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: 4820905

Carbonizing furnace

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Abstract

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A carbonizing furnace includes a heating chamber with a wall having channels therein, a carbon heater in the channels, a heat insulator composed of carbon fiber felt and a ceramic fiber felt which covers the heating chamber such that the carbon fiber felt is in contacting with the heating chamber and the ceramic fiber felt is separated by a space from the carbon fiber felt, and a housing enclosing the heating chamber and the heat insulator, and an inlet for filling the insulator with an inert gas. The carbonizing furnace can be run stably and continuously.

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Description

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Claims

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Legal Events

 

• FPAY2000
• FPAY1996
• FEPP1995
• FPAY1992
• FEPP1991
• I1989
• STCF1989
• F1987
• AS1987
• PD1986

Date	Code	Event	Description
Sep 25, 2000	FPAY	FEE PAYMENT	year of fee payment: 12
Sep 30, 1996	FPAY	FEE PAYMENT	year of fee payment: 8
Dec 06, 1995	FEPP	FEE PAYMENT PROCEDURE	free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY
Sep 23, 1992	FPAY	FEE PAYMENT	year of fee payment: 4
Nov 01, 1991	FEPP	FEE PAYMENT PROCEDURE	free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY
Apr 11, 1989	I	Issuance
Feb 10, 1989	STCF	INFORMATION ON STATUS: PATENT GRANT	free format text: PATENTED CASE
Jul 09, 1987	F	Filing
Jul 01, 1987	AS	ASSIGNMENT	free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:IWATA, YOSHIKAZU;SUGIYAMA, MAKOTO;MIYAUCHI, MOTOHISA;REEL/FRAME:004979/0410 Owner name: TOHO RAYON CO., LTD., NO. 3-9, NIHONBASHI 3-CHOME, Effective Date: Jul 01, 1987
Jul 09, 1986	PD	Priority Date