US2755181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of introducing boron into ferrous metal
Assignee: Air Liquide SA
•
Filing: 1952-10-09
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Granted: 1956-07-17
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Expires: 1972-10-09
Abstract
No abstract record available.
Inventors
- 👤 Spire Etienne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:33
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/002
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
79 words
A PROCESS OF INTRODUCING BORON INTO A FERROS METAL CONTAINING NORMAL NITROGEN AND MAINTAINED IN THE MOLTEN STATE IN A CONTAINER PROVIDED IN ITS BOTTOM WITH A POROUS PLUG FOR INTRODUCING A GAS IN A FINELY DIVIDED FORM THROUGH THE MOLTEN METAL BATH, CONSISTING IN SIMULTANEOUSLY SUPPLYING TO THE SURFACE OF THE MOLTEN BATH A SLAG COMPRISING A BORATING AGENT AND A REDUCING AGENT, AND FLUSHING SAID BATH THROUGH SAID POROUS PLUG WITH A NON OXIDIZING NITROGEN-FREE INERT GAS.
References Cited (Backward Citations)
US898116A
Cited
US1519388A
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US1674119A
Cited
US1608270A
Cited
US1763248A
Cited
US2280283A
Cited
US2283299A
Cited
US2528867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |