Patent CA974356A successfully refreshed from Google Patents.
Patent US2537103A successfully refreshed from Google Patents.
US2537103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of nitrogen-bearing stainless steel
Assignee: Armco Inc
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Filing: 1946-03-19
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Granted: 1951-01-09
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Expires: 1966-03-19
Abstract
No abstract record available.
Inventors
- 👤 Tanczyn Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:01
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
IN THE PRODUCTION IN AN ELECTRIC FURNACE OF STAINLESS STEEL CONTAINING AT LEAST 0.07% NITROGEN WHEREIN THERE IS PREPARED A BATH OF STAINLESS STEEL CONTAINING ABOUT 10% TO 30% CHROMIUM AND OF LOW CARBON CONTENT AND HAVING OXIDES OF CHROMIUM DISPERSED THERETHROUGH, THE ART WHICH COMPRISES ADDING TO SAID METAL BATH A DEOXIDIZING AGENT OF THE GROUP CONSISTING OF ALUMINUM AND CALCIUM-SILICON FOR SUBSTANTIALLY DEPLETING CHROMIUM OXIDES AND THEREBY INCREASING THE ABILITY OF THE METAL TO ABSORB NITROGEN, AND ADDING ONE OF THE GROUP CONSISTING OF NITROGEN GAS AND A DECOMPOSIBLE NITRIDE TO SAID TREATED BATH WHEREBY THERE IS ACHIEVED STAINLESS STEEL OF DESIRED NITROGEN CONTENT.
Claim 2
Dependent Claim
106 words
IN THE PRODUCTION IN AN ELECTRIC FURNACE OF STAINLESS STEEL CONTAINING AT LEAST 0.07% NITROGEN WHEREIN THERE IS PREPARED A BATH OF STAINLESS STEEL CONTAINING ABOUT 10% TO 30% CHROMIUM AND OF LOW CARBON CONTENT AND HAVING OXIDES OF CHROMIUM DISPERSED THERETHROUGH, THE ART WHICH COMPRISES ADDING TO SAID METAL BATH A DEOXIDIZING AGENT OF THE GROUP CONSISTING OF ALUMINUM AND CALCIUM-SILICON FOR SUBSTANTIALLY DEPLETING CHROMIUM OXIDES AND THEREBY INCREASING THE ABILITY OF THE METAL TO ABSORB NITROGEN, AND ADDING ONE OF THE GROUP CONSISTING OF NITROGEN GAS AND A DECOMPOSIBLE NITRIDE TO SAID TREATED BATH WHEREBY THERE IS ACHIEVED STAINLESS STEEL OF DESIRED NITROGEN CONTENT.
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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) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |