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

Patent Owner(s)

Patent Owner	Address
ALLEGHENY LUDLUM CORPORATION	PITTSBURGH PENNSYLVANIA 15222-5479

International Classification(s)

• C21D:MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS....

• 1995 Application Filing Year
• C21D Class
• 140 Applications Filed
• 76 Patents Issued To-Date
• 54.29 % Issued To-Date

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Parayil, Thomas R	New Kensington, PA	12	94
# of filed Patents : 12 Total Citations : 94

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Patent Citation Ranking

• 7 Citation Count
• C21D Class

• 4.17 % this patent is cited more than
• 29 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: 5529644

Stainless steel and carbon steel composite and method of producing the same

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Abstract

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A pressure-bonded composite material includes at least one layer of a stabilized low carbon steel core material and one layer of a stainless steel joined at an interface, wherein the stabilized carbon steel includes columbium (niobium) and at least one other carbide-forming element in amounts effective to prevent carbon migration from the carbon steel to the stainless steel and the composite material has a physical grain size no larger than ASTM #6.

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Description

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Claims

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Legal Events

 

• AS2011
• REMI2007
• FPAY2007
• FPAY2003
• AS2003
• FPAY1999
• FEPP1998
• I1996
• STCF1996
• F1995
• PD1993

Date	Code	Event	Description
Feb 17, 2011	AS	ASSIGNMENT	free format text: RELEASE BY SECURED PARTY;ASSIGNOR:PNC BANK, NATIONAL ASSOCIATION, AS AGENT FOR THE LENDERS;REEL/FRAME:025845/0321 Owner name: ATI PROPERTIES, INC., OREGON Effective Date: Feb 17, 2011
Dec 31, 2007	REMI	MAINTENANCE FEE REMINDER MAILED
Dec 26, 2007	FPAY	FEE PAYMENT	year of fee payment: 12
Dec 29, 2003	FPAY	FEE PAYMENT	year of fee payment: 8
Jun 13, 2003	AS	ASSIGNMENT	free format text: SECURITY INTEREST;ASSIGNOR:ATI PROPERTIES, INC.;REEL/FRAME:014186/0295 Owner name: PNC BANK, NATIONAL ASSOCIATION, PENNSYLVANIA Effective Date: Jun 13, 2003
Dec 23, 1999	FPAY	FEE PAYMENT	year of fee payment: 4
Oct 31, 1998	FEPP	FEE PAYMENT PROCEDURE	free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY
Jun 25, 1996	I	Issuance
Jun 12, 1996	STCF	INFORMATION ON STATUS: PATENT GRANT	free format text: PATENTED CASE
May 30, 1995	F	Filing
Mar 31, 1993	PD	Priority Date