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

Patent Owner(s)

Patent Owner	Address
AMAX INC	A CORP OF NEW YORK AMAX CENTER GREENWICH CT 06830

International Classification(s)

• C01G:COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLAS....

• 1989 Application Filing Year
• C01G Class
• 145 Applications Filed
• 1 Patents Issued To-Date
• 0.69 % Issued To-Date

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Beckstead, Leo W	Arvada, CO	22	131
# of filed Patents : 22 Total Citations : 131
Chou, Eddie C	Arvada, CO	5	39
# of filed Patents : 5 Total Citations : 39
Kearns, Tom C	Donnellson, IA	1	2
# of filed Patents : 1 Total Citations : 2

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Patent Citation Ranking

• 2 Citation Count
• C01G Class

• 0 % this patent is cited more than
• 35 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: 4963336

Purification of APT

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Abstract

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Directed to a process for producing a tungsten product of enhanced purity from ammonium paratungstate (APT) with a minimum number of processing steps which comprises mixing the APT with an ammonium solution, autoclaving the mixture at a temperature above the boiling point thereof to dissolve the APT and recrystallizing APT from the solution to yield an APT product of enhanced marketability.

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Description

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Claims

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Legal Events

 

• REMI2002
• FPAY2002
• FPAY1998
• FPAY1994
• I1990
• STCF1990
• F1989
• PD1989
• AS1989

Date	Code	Event	Description
Apr 30, 2002	REMI	MAINTENANCE FEE REMINDER MAILED
Apr 15, 2002	FPAY	FEE PAYMENT	year of fee payment: 12
Apr 15, 1998	FPAY	FEE PAYMENT	year of fee payment: 8
Apr 14, 1994	FPAY	FEE PAYMENT	year of fee payment: 4
Oct 16, 1990	I	Issuance
Aug 15, 1990	STCF	INFORMATION ON STATUS: PATENT GRANT	free format text: PATENTED CASE
Sep 25, 1989	F	Filing
Sep 25, 1989	PD	Priority Date
Sep 18, 1989	AS	ASSIGNMENT	free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:BECKSTEAD, LEO W.;KEARNS, TOM C.;CHOU, EDDIE C.;REEL/FRAME:005154/0037 Owner name: AMAX INC., CONNECTICUT Effective Date: Sep 18, 1989