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

Patent Owner(s)

Patent Owner	Address
SHANDONG UNIVERSITY	NO 17923 JINGSHI ROAD LIXIA DISTRICT JINAN SHANDONG 250061

International Classification(s)

• F24C:OTHER DOMESTIC STOVES OR RANGES; DETAILS OF DOMEST....

• 2010 Application Filing Year
• F24C Class
• 159 Applications Filed
• 113 Patents Issued To-Date
• 71.07 % Issued To-Date

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
ZHU, Ruifu	Jinan, CN	1	0
# of filed Patents : 1 Total Citations : 0

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• 0 Citation Count
• F24C Class

• 0 % this patent is cited more than
• 15 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: 5246598

Destruction of cyanide and other pollutants in aqueous solutions

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Abstract

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A method is disclosed for detoxifying an aqueous waste solution containing cyanide. The method involves adding a source of silicon oxide to the cyanide containing aqueous waste solution in a concentration of 0.001 to 10 g silicon dioxide/liter aqueous waste solution, at an alkaline pH and a temperature of from 10.degree. to 100.degree. C. Hydrogen peroxide or another peroxygen compound is added in a sufficient quantity to convert the aqueous waste solution containing cyanide to an aqueous solution containing environmentally less toxic materials.

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Description

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Claims

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Legal Events

 

• STCH2005
• FP2005
• LAPS2005
• REMI2005
• PRDP2002
• FPAY2002
• SULP2002
• FEPP2001
• FEPP2001
• REIN2001
• FP2001
• REMI2001
• FPAY2000
• AS1999
• FPAY1997
• FEPP1996
• FEPP1995
• I1993
• AS1993
• F1992
• PD1992

Date	Code	Event	Description
Oct 19, 2005	STCH	INFORMATION ON STATUS: PATENT DISCONTINUATION	free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362
Sep 21, 2005	FP	LAPSED DUE TO FAILURE TO PAY MAINTENANCE FEE	Effective Date: Sep 21, 2005
Sep 21, 2005	LAPS	LAPSE FOR FAILURE TO PAY MAINTENANCE FEES
Apr 06, 2005	REMI	MAINTENANCE FEE REMINDER MAILED
Oct 14, 2002	PRDP	PATENT REINSTATED DUE TO THE ACCEPTANCE OF A LATE MAINTENANCE FEE	Effective Date: Oct 14, 2002
Sep 30, 2002	FPAY	FEE PAYMENT	year of fee payment: 8
Sep 30, 2002	SULP	SURCHARGE FOR LATE PAYMENT
Dec 09, 2001	FEPP	FEE PAYMENT PROCEDURE	free format text: PETITION RELATED TO MAINTENANCE FEES FILED (ORIGINAL EVENT CODE: PMFP); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY
Oct 31, 2001	FEPP	FEE PAYMENT PROCEDURE	free format text: PETITION RELATED TO MAINTENANCE FEES GRANTED (ORIGINAL EVENT CODE: PMFG); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY
Sep 23, 2001	REIN	REINSTATEMENT AFTER MAINTENANCE FEE PAYMENT CONFIRMED
Sep 21, 2001	FP	LAPSED DUE TO FAILURE TO PAY MAINTENANCE FEE	Effective Date: Sep 21, 2001
Apr 17, 2001	REMI	MAINTENANCE FEE REMINDER MAILED
Mar 27, 2000	FPAY	FEE PAYMENT	year of fee payment: 4
Feb 16, 1999	AS	ASSIGNMENT	free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DEGUSSA CORPORATION;REEL/FRAME:009901/0207 Owner name: DEGUSSA-HULS CORPORATION, NEW JERSEY Effective Date: Feb 16, 1999
Jan 31, 1997	FPAY	FEE PAYMENT	year of fee payment: 4
Dec 02, 1996	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
Nov 01, 1995	FEPP	FEE PAYMENT PROCEDURE	free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY
Sep 21, 1993	I	Issuance
May 21, 1993	AS	ASSIGNMENT	free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:PROULX, CHRISTOPHER R.;CHATTOPADHYAY, JAGANMAY;EUL, WILFRIED;AND OTHERS;REEL/FRAME:006548/0178;SIGNING DATES FROM 19930414 TO 19930429 Owner name: DEGUSSA CORPORATION, NEW JERSEY
Dec 22, 1992	F	Filing
Dec 22, 1992	PD	Priority Date