Patent US1707832A successfully refreshed from Google Patents.
Patent US3199976A successfully refreshed from Google Patents.
US3199976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of steel
Assignee: Rheinstahl Huettenwerke AG
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Filing: 1964-06-17
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Granted: 1965-08-10
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Expires: 1984-06-17
Abstract
No abstract record available.
Inventors
- 👤 Dammer August
- 👤 Breuing Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:50
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/30; C21C5/32; C21C7/00; C21C7/04; C21C7/072
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
PROCESS FOR REDUCING THE HYDROGEN CONTENT OF STEEL MELTS, WHICH COMPRISES MAINTAINING A BATH OF MOLTEN STEEL WITH SLAG COVERING THE SURFACE THEROF AND BLOWING A STREAM OF OXYGEN AND .5 TO 7% BY VOLUME, BASED ON SAID OXYGEN, OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF LOWER COMPLETELY CHLORINATED ALKANES, LOWER COMPLETELY FLUOROCHLORINATE ALKANES, AND MIXTURES THEREOF, AGAINST THE SLAG WITH A VELOCITY SUFFICIENT TO CAUSE INTERMIXING OF THE SLAG AND THE UPPER PORTION OF THE BATH FOR A PERIOD OF TIME SUFFICIENT TO SUBSTANTIALLY REDUCE THE HYDROGEN CONTENT OF THE MELT.
Claim 2
Dependent Claim
94 words
PROCESS FOR REDUCING THE HYDROGEN CONTENT OF STEEL MELTS, WHICH COMPRISES MAINTAINING A BATH OF MOLTEN STEEL WITH SLAG COVERING THE SURFACE THEROF AND BLOWING A STREAM OF OXYGEN AND .5 TO 7% BY VOLUME, BASED ON SAID OXYGEN, OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF LOWER COMPLETELY CHLORINATED ALKANES, LOWER COMPLETELY FLUOROCHLORINATE ALKANES, AND MIXTURES THEREOF, AGAINST THE SLAG WITH A VELOCITY SUFFICIENT TO CAUSE INTERMIXING OF THE SLAG AND THE UPPER PORTION OF THE BATH FOR A PERIOD OF TIME SUFFICIENT TO SUBSTANTIALLY REDUCE THE HYDROGEN CONTENT OF THE MELT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-09 | 1969-02-08 | 1969-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-09 | 1973-02-08 | 1973-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-09 | 1977-02-08 | 1977-08-10 | $7700.00 | Window Closed / Lapsed |