Corrosion resistant austenitic stainless steel
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Mar 14, 2000
Grant Date -
N/A
app pub date -
Dec 17, 1998
filing date -
Dec 17, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
An alloy having a composition, by weight, of about 0.025% or less carbon, about 0.5 to about 4.1% manganese, about 5.5 to about 6.2% silicon, about 11 to about 15% chromium, about 9.0 to about 15.5% nickel, about 0.8 to about 1.2% molybdenum and about 0.8 to about 2% copper and the remainder being essentially iron with incidental impurities. This composition results in lean alloy content in a high silicon austenitic stainless steel for concentrated sulfuric acid service while maintaining a corrosion rate similar to and competitive with existing alloys for such service. Acceptable characteristics were found when hot working was carried out in the range of about 2100.degree. F. to about 2200.degree. F. Annealing in the range of about 1925.degree. F. to about 2025.degree. F. is preferred, as is rapid water quenching after annealing.
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
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ALLEGHENY LUDLUM CORPORATION | 1000 SIX PPG PLACE PITTSBURGH PENNSYLVANIA 15222 |
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
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Grubb, John F | Lower Burrell, PA | 18 | 167 |
# of filed Patents : 18 Total Citations : 167 | |||
Sorace, Dominic A | Server, PA | 4 | 29 |
# of filed Patents : 4 Total Citations : 29 |
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Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
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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 |
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Legal Events
Date | Code | Event | Description |
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Oct 13, 2014 | STCH | INFORMATION ON STATUS: PATENT DISCONTINUATION | free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
Sep 17, 2014 | FP | LAPSED DUE TO FAILURE TO PAY MAINTENANCE FEE | Effective Date: Sep 17, 2014 |
Sep 17, 2014 | LAPS | LAPSE FOR FAILURE TO PAY MAINTENANCE FEES | |
Apr 25, 2014 | REMI | MAINTENANCE FEE REMINDER MAILED | |
Feb 18, 2010 | FPAY | FEE PAYMENT | year of fee payment: 8 |
Dec 02, 2009 | FEPP | FEE PAYMENT PROCEDURE | free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
Feb 23, 2006 | FPAY | FEE PAYMENT | year of fee payment: 4 |
Sep 17, 2002 | I | Issuance | |
Jun 27, 2000 | F | Filing | |
Jun 13, 2000 | AS | ASSIGNMENT | free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GANTER, CHRISTIAN;REEL/FRAME:010900/0960 Owner name: GRAPHA-HOLDING AG, SWITZERLAND Effective Date: Jun 13, 2000 |
Jul 22, 1999 | PD | Priority Date |

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