US3333987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon-stabilized steel products and method of making the same
Assignee: Inland Steel Co
•
Filing: 1964-12-02
•
Granted: 1967-08-01
•
Expires: 1984-12-02
Abstract
No abstract record available.
Inventors
- 👤 Carlton F Schrader
- 👤 Michael C Kopchak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:18
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/14; C21; C21C; C21C7/00; C21D; C21D9/00; C21D9/46; C21D9/48; C23; C23D; C23D5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A PROCESS FOR MAKING A CARBON-STABILIZED STEEL WHICH COMPRISES ADDING TO A MOLTEN STEEL CONTAINING FROM ABOUT .04 WT. PERCENT TO ABOUT .10 WT. PERCENT CARBON THE AMOUNT OF SAID ELEMENT ADDED OF A CARBIDE-FORMING ELEMENT SELECTED FROM THE GROUP CONSISTING OF TITANIUM, COLUMBIUM, ZIRCONIUM, AND MIXTURES THEREOF, SAID PREDETERMINED AMOUNT BEING LESS THAN THE STOICHIOMETRIC AMOUNT REQUIRED TO COMBINE WITH SAID CARBON, AND THEREAFTER DECARBURIZING SAID STEEL TO REMOVE THE CARBON WHICH IS NOT COMBINED WITH SAID ELEMENT.
Claim 2
Dependent Claim
79 words
A PROCESS FOR MAKING A CARBON-STABILIZED STEEL WHICH COMPRISES ADDING TO A MOLTEN STEEL CONTAINING FROM ABOUT .04 WT. PERCENT TO ABOUT .10 WT. PERCENT CARBON THE AMOUNT OF SAID ELEMENT ADDED OF A CARBIDE-FORMING ELEMENT SELECTED FROM THE GROUP CONSISTING OF TITANIUM, COLUMBIUM, ZIRCONIUM, AND MIXTURES THEREOF, SAID PREDETERMINED AMOUNT BEING LESS THAN THE STOICHIOMETRIC AMOUNT REQUIRED TO COMBINE WITH SAID CARBON, AND THEREAFTER DECARBURIZING SAID STEEL TO REMOVE THE CARBON WHICH IS NOT COMBINED WITH SAID ELEMENT.
References Cited (Backward Citations)
US2459836A
Cited
US2455331A
Cited
US2755210A
Cited
US3055779A
Cited
US3193417A
Cited
US3228810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-31 | 1971-01-30 | 1971-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-31 | 1975-01-30 | 1975-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-31 | 1979-01-30 | 1979-08-01 | $7700.00 | Window Closed / Lapsed |