US3201226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steel purification vacuum method
Assignee: RUHRSTAHL HUTTENWERKE AG
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Filing: 1962-08-06
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Granted: 1965-08-17
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Expires: 1982-08-06
Abstract
No abstract record available.
Inventors
- 👤 Spolders Rudolf
- 👤 Breuing Wilhelm
- 👤 Pieper Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:25
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
IN A METHOD OF PURIFYING MOLTEN STEEL, THE STEPS OF SUBJECTING A MASS OF UNKILLED MOLTEN STEEL TO A PARTIAL VACUUM; BLOWING HYDROGEN GAS INTO THE BOTTOM PORTION OF SAID MASS OF UNKILLED MOLTEN STEEL; AND SIMULTANEOUSLY BLOWING INTO THE INTERIOR OF SAID MASS OF MOLTEN STEEL AT A POINT LOCATED ABOVE SAID BOTTOM PORTIONTHEREOF A SECOND GAS SELECTED FROM THE GROUP CONSISTING OF ARGON AND CARBON MONOXIDE WHILE MAINTAINING SAID PARTIAL VACUUM.
Claim 2
Dependent Claim
73 words
IN A METHOD OF PURIFYING MOLTEN STEEL, THE STEPS OF SUBJECTING A MASS OF UNKILLED MOLTEN STEEL TO A PARTIAL VACUUM; BLOWING HYDROGEN GAS INTO THE BOTTOM PORTION OF SAID MASS OF UNKILLED MOLTEN STEEL; AND SIMULTANEOUSLY BLOWING INTO THE INTERIOR OF SAID MASS OF MOLTEN STEEL AT A POINT LOCATED ABOVE SAID BOTTOM PORTIONTHEREOF A SECOND GAS SELECTED FROM THE GROUP CONSISTING OF ARGON AND CARBON MONOXIDE WHILE MAINTAINING SAID PARTIAL VACUUM.
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) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |