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Country	kind	publication No.	Filing Date	Type	Sub-Type
EP	B1	EP0497298	Jan 29, 1992	Patent	Grant
Type : Patent Sub-Type : Grant
Patent		Verfahren zum Klotzfärben von Zellulosefasern mit Schwefelschwarzfarbstoffen		Jun 21, 1995

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

Patent Owner(s)

Patent Owner	Address
HOECHST AKTIENGESELLSCHAFT	65926 FRANKFURT AM MAIN

International Classification(s)

• D06P:DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS,....

• 1992 Application Filing Year
• D06P Class
• 121 Applications Filed
• 40 Patents Issued To-Date
• 33.06 % Issued To-Date

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Hahnke, Manfred	Kelkheim, DE	23	138
# of filed Patents : 23 Total Citations : 138
Krauzpaul, Gerd	Liederbach, DE	1	3
# of filed Patents : 1 Total Citations : 3
Saalfrank, Ullrich	Eppstein/Taunus, DE	1	3
# of filed Patents : 1 Total Citations : 3
Schuster, Claus	Hofheim am Taunus, DE	5	40
# of filed Patents : 5 Total Citations : 40
Steinbach, Joachim	Frankfurt am Main, DE	3	15
# of filed Patents : 3 Total Citations : 15

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Patent Citation Ranking

• 3 Citation Count
• D06P Class

• 17.02 % this patent is cited more than
• 32 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: 5234465

Pad-dyeing of cellulose fibers with sulfur black dyes: mixture of dithionite and glucose reducing sugar as reducing agent in aqueous alkaline dye bath

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Abstract

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Cellulose fibers are dyed ecologically soundly with sulfur black dyes by the pad-dyeing process by avoiding sulfides as reducing agent by replacing them by a dithionite-based mixture with at least one reducing sugar. A high color yield, a deep black shade and good reproducibility are ensured. The preferred reducing sugar is glucose.

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Description

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Claims

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Legal Events

 

• FPAY2005
• FPAY2001
• FPAY1997
• I1993
• STCF1993
• FEPP1992
• F1992
• AS1992
• PD1991

Date	Code	Event	Description
Jan 11, 2005	FPAY	FEE PAYMENT	year of fee payment: 12
Jan 18, 2001	FPAY	FEE PAYMENT	year of fee payment: 8
Jan 21, 1997	FPAY	FEE PAYMENT	year of fee payment: 4
Aug 10, 1993	I	Issuance
Jul 28, 1993	STCF	INFORMATION ON STATUS: PATENT GRANT	free format text: PATENTED CASE
Dec 08, 1992	FEPP	FEE PAYMENT PROCEDURE	free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY
Jan 29, 1992	F	Filing
Jan 23, 1992	AS	ASSIGNMENT	free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:HAHNKE, MANFRED;SAALFRANK, ULLRICH;SCHUSTER, CLAUS;AND OTHERS;REEL/FRAME:005999/0993 Owner name: HOECHST AKTIENGESELLSCHAFT Effective Date: Jan 23, 1992
Jan 31, 1991	PD	Priority Date