US2820706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace and method for making steel
Assignee: United States Steel Corp
•
Filing: 1955-07-26
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Granted: 1958-01-21
•
Expires: 1975-07-26
Abstract
No abstract record available.
Inventors
- 👤 Bernard M Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:44
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A METHOD OF MAKING STEEL COMPRISING MELTING DOWN IRON SCRAP AND A FLUX OF THE GROUP CONSISTING OF LIMESTONE BURNT LIME AND MIXTURES THEREOF AND ADDING HOT METAL THERTO TO FORM A BATH OF MOLTEN FERROUS METAL WHICH CARRIES A LAYER OF MOLTEN SLAG, APPLYING COMMERCIALLY PURE OXYGEN GAS OVER SAID SLAG LAYER UNDER A PRESSURE INSUFFICIENT TO PENETRATE THIS LAYER MECHANICALLY, AND TRANSFERRING OXYGEN TO THE METAL OF SAID BATH EXCLUSIVELY BY ABSORPTION AND DIFFUSION PLUS CONVECTION THROUGH SAID SLAG LAYER.
Claim 2
Independent Claim
82 words
A METHOD OF MAKING STEEL COMPRISING MELTING DOWN IRON SCRAP AND A FLUX OF THE GROUP CONSISTING OF LIMESTONE BURNT LIME AND MIXTURES THEREOF AND ADDING HOT METAL THERTO TO FORM A BATH OF MOLTEN FERROUS METAL WHICH CARRIES A LAYER OF MOLTEN SLAG, APPLYING COMMERCIALLY PURE OXYGEN GAS OVER SAID SLAG LAYER UNDER A PRESSURE INSUFFICIENT TO PENETRATE THIS LAYER MECHANICALLY, AND TRANSFERRING OXYGEN TO THE METAL OF SAID BATH EXCLUSIVELY BY ABSORPTION AND DIFFUSION PLUS CONVECTION THROUGH SAID SLAG LAYER.
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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) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |