US2993780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for treating steel in vacuo
Assignee: Institut de Recherches de la Siderurgie Francaise IRSID
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Filing: 1958-11-12
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Granted: 1961-07-25
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Expires: 1978-11-12
Abstract
No abstract record available.
Inventors
- 👤 Allard Marc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:15
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A METHOD OF PRODUCING STEEL, COMPRISING THE STEPS OF CONVERTING A LIQUID METAL BATH TO STEEL IN A REACTION CHAMBER, COMPLETELY SKIMMING THE LIQUID STEEL BATH, CHANGING THE DEPTH OF THE BATH IN THE CHAMBER WITHOUT LOSS OF HEAT TO REDUCE THE BATH DEPTH TO THE LOWEST POSSIBLE LEVEL IN THE CHAMBER, BLOWING BUBBLES OF A GAS WHICH IS INERT TO THE BATH THROUGH THE BATH TO STIR THE SAME, SIMULTANEOUSLY APPLYING A VACUUM TO THE CHAMBER, AND THEN CASTING THE LIQUID STEEL OUT OF THE CHAMBER.
Claim 2
Independent Claim
87 words
A METHOD OF PRODUCING STEEL, COMPRISING THE STEPS OF CONVERTING A LIQUID METAL BATH TO STEEL IN A REACTION CHAMBER, COMPLETELY SKIMMING THE LIQUID STEEL BATH, CHANGING THE DEPTH OF THE BATH IN THE CHAMBER WITHOUT LOSS OF HEAT TO REDUCE THE BATH DEPTH TO THE LOWEST POSSIBLE LEVEL IN THE CHAMBER, BLOWING BUBBLES OF A GAS WHICH IS INERT TO THE BATH THROUGH THE BATH TO STIR THE SAME, SIMULTANEOUSLY APPLYING A VACUUM TO THE CHAMBER, AND THEN CASTING THE LIQUID STEEL OUT OF THE CHAMBER.
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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) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |