US3761242A
Expired / Lapsed
US
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Method of treating molten metal by gas purging rhtough a porous plug
Assignee: Finkl & Sons Co
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Filing: 1970-04-30
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Granted: 1973-09-25
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Expires: 1990-04-30
Abstract
Abstract STEEL TREATING PROCESS FOR LOWERING GAS CONTENT OF STEEL IN WHICH CYCLE TIME IS MINIMIZED AND HEAT LOSS ELIMINATED UNTIL FINAL PORTION OF THE CYCLE. STEEL IS PRE-DEGASSED BY PURGING UNDER SUBSTANTIALLY ATMOSPHERIC PRESSURE AND ENVIRONMENTAL CONDITIONS WHILE ADDING HEAT, PREFERABLY IN THE MELTING UNIT, AND THEN FINISH DEGASESD BY SUBJECTION TO A LOW ABSOLUTE VACUUM.
Inventors
- 👤 C Finkl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:05
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10; C21C5/00; C21C5/52; C21C5/5211; C21C5/5217; C21C5/5252; C21C5/5294; F; F27; F27B; F27B3/00; F27B3/10; F27B3/22; F27B3/225; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |