US3240636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating sheet steel
Assignee: Cockerill Ougree Providence et Esperance Longdoz
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Filing: 1964-11-25
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Granted: 1966-03-15
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Expires: 1984-11-25
Abstract
No abstract record available.
Inventors
- 👤 Daubersy Jean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:35
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/02; C21; C21C; C21C7/00; C21C7/0025; C21D; C21D1/00; C21D1/74; C21D1/76; C21D3/00; C21D3/02; C21D9/00; C21D9/46; C21D9/48; C23C10/00; C23C10/02; C23C8/00; C23C8/06; C23C8/08; C23C8/20; C23C8/22; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/143
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
IN A PROCESS COMPRISING THE STEP OF EXTRACTING CARBON AND NITROGEN OUT OF A SHEET STEEL BY THE ACTION OF AN ATMOSPHERE OF WET HYDROGEN DURING A DURATION LONG ENOUGH THAT THE SHEET STEEL CONTAINS LESS THAN 0.005% BY WEIGHT OF CARBON AND 0.0005% BY WEIGHT OF NITROGEN SO AS TO RENDER SAID SHEET NON-AGING BUT SUBJECT TO BRITTLENESS, THE INVENTION WHICH CONSISTS IN SUBSEQUENTLY SUPERFICIALLY RECARBURIZING THE SHEET STEEL BY HEATING IT IN AN ATMOSPHERE COMPRISING A CARBON-CONTAINING GAS SO AS TO ACHIEVE AN UPTAKE OF CARBON UP TO 0.001% MAXIMUM.
Claim 2
Dependent Claim
92 words
IN A PROCESS COMPRISING THE STEP OF EXTRACTING CARBON AND NITROGEN OUT OF A SHEET STEEL BY THE ACTION OF AN ATMOSPHERE OF WET HYDROGEN DURING A DURATION LONG ENOUGH THAT THE SHEET STEEL CONTAINS LESS THAN 0.005% BY WEIGHT OF CARBON AND 0.0005% BY WEIGHT OF NITROGEN SO AS TO RENDER SAID SHEET NON-AGING BUT SUBJECT TO BRITTLENESS, THE INVENTION WHICH CONSISTS IN SUBSEQUENTLY SUPERFICIALLY RECARBURIZING THE SHEET STEEL BY HEATING IT IN AN ATMOSPHERE COMPRISING A CARBON-CONTAINING GAS SO AS TO ACHIEVE AN UPTAKE OF CARBON UP TO 0.001% MAXIMUM.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |