Patent US3198624A successfully refreshed from Google Patents.
US3198624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of stainless steel
Assignee: Interlake Steel Corp
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Filing: 1961-08-24
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Granted: 1965-08-03
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Expires: 1981-08-24
Abstract
No abstract record available.
Inventors
- 👤 Thaddeus F Bell
- 👤 David G Bowser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:28
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C21; C21C; C21C5/00; C21C5/005; C22C38/40; C21C7/00; C21C2007/0093
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
THE PROCESS OF MAKING STAINLESS STEEL, COMPRISING PREPARING MOLTEN CHROMIUM BEARING IRON HAVING APPROXIMATELY 5% TO 25% CHROMIUM AND APPROXIMATELY 3% TO 5% CARBON FROM A CHROMIUM BEARING COKE WITH ABOUT 20% BY WEIGHT OF CHROMIUM BEARING MATERIAL BASED ON A CHROMITE ORE CONTAINING ABOUT 50% OF CR2O3, AND IN A COMBUSTION TYPE FURNACE, PROVIDING THE MOLTEN IRON WITH APPROXIMATELY 0.5% TO 5% SILICON TO MAINTAIN THE TEMPERATURE SUFFICIENTLY HIGH AND AT LEAST AT 3100*F. TO RESTRICT OXIDATION OF THE CHROMIUM BEFORE OXIDATION OF THE CARBON, INTRODUCING THE MOLTEN IRON INTO AN OPEN REFINING VESSEL, MAINTAINING SAID TEMPERATURE, AND SUBJECTING THE MOLTEN IRON TO A STREAM OF OXYGEN SUFFICIENT TO PRODUCE STAINLESS STEEL HAVING APPROXIMATELY 12% TO 18% CHROMIUM AND UP TO 0.12% CARBON THEREIN.
Claim 2
Dependent Claim
125 words
THE PROCESS OF MAKING STAINLESS STEEL, COMPRISING PREPARING MOLTEN CHROMIUM BEARING IRON HAVING APPROXIMATELY 5% TO 25% CHROMIUM AND APPROXIMATELY 3% TO 5% CARBON FROM A CHROMIUM BEARING COKE WITH ABOUT 20% BY WEIGHT OF CHROMIUM BEARING MATERIAL BASED ON A CHROMITE ORE CONTAINING ABOUT 50% OF CR2O3, AND IN A COMBUSTION TYPE FURNACE, PROVIDING THE MOLTEN IRON WITH APPROXIMATELY 0.5% TO 5% SILICON TO MAINTAIN THE TEMPERATURE SUFFICIENTLY HIGH AND AT LEAST AT 3100*F. TO RESTRICT OXIDATION OF THE CHROMIUM BEFORE OXIDATION OF THE CARBON, INTRODUCING THE MOLTEN IRON INTO AN OPEN REFINING VESSEL, MAINTAINING SAID TEMPERATURE, AND SUBJECTING THE MOLTEN IRON TO A STREAM OF OXYGEN SUFFICIENT TO PRODUCE STAINLESS STEEL HAVING APPROXIMATELY 12% TO 18% CHROMIUM AND UP TO 0.12% CARBON THEREIN.
References Cited (Backward Citations)
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GB197733A
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GB198633A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |