US3145096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of degassing of molten metal
Assignee: Finkl A and Sons Co
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Filing: 1961-06-05
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Granted: 1964-08-18
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Expires: 1981-06-05
Abstract
No abstract record available.
Inventors
- 👤 Charles W Finkl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:50
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A METHOD OF VACUUM DEGASSING A BATH OF MOLTEN STEEL IN A CONTAINER WITHIN THE PERMISSIBLE TEMPERATURE DROP LOCATION OF THE METAL, SAID METHOD INCLUDING THE STEPS OF REMOVING A SUBSTANTIAL QUANTITY OF THE SLAG FROM THE SURFACE OF THE BATH AND THEREAFTER, IN THE ABSENCE OF A DEOXIDIZER SUFFICIENTLY ACTIVE TO DEOXIDIZE THE MOLTEN METAL TO AN APPRECIABLE EXTENT PRIOR TO DEGASSING, SUBJECTING THE MOLTEN METAL TO A VACUUM APPROACHING 2 MM. HG OR LESS FOR A PERIOD OF TIME DETERMINED BY THE FORMULA T=((D IN INCHES)/10 TO 30)(**2) IN WHICH T= TIME IN MINUTES AT WHICH THE HEAT IS SUBJECTED TO THE VACUUM AND D=DEPTH OF THE MOLTEN METAL IN INCHES, AND DURING THE SUBJECTION OF THE MOLTEN METAL TO VACUUM, REDUCING HEAT TRANSFER FROM THE BATH TO A MINIMUM BY MAINTAINING LITTLE TEMPERATURE DIFFERENTIAL BETWEEN THE UPPER SURFACE OF THE BATH AND A RADIANT HEAT INTERCEPTING SURFACE LOCATED THEREABOVE.
Claim 2
Independent Claim
152 words
A METHOD OF VACUUM DEGASSING A BATH OF MOLTEN STEEL IN A CONTAINER WITHIN THE PERMISSIBLE TEMPERATURE DROP LOCATION OF THE METAL, SAID METHOD INCLUDING THE STEPS OF REMOVING A SUBSTANTIAL QUANTITY OF THE SLAG FROM THE SURFACE OF THE BATH AND THEREAFTER, IN THE ABSENCE OF A DEOXIDIZER SUFFICIENTLY ACTIVE TO DEOXIDIZE THE MOLTEN METAL TO AN APPRECIABLE EXTENT PRIOR TO DEGASSING, SUBJECTING THE MOLTEN METAL TO A VACUUM APPROACHING 2 MM. HG OR LESS FOR A PERIOD OF TIME DETERMINED BY THE FORMULA T=((D IN INCHES)/10 TO 30)(**2) IN WHICH T= TIME IN MINUTES AT WHICH THE HEAT IS SUBJECTED TO THE VACUUM AND D=DEPTH OF THE MOLTEN METAL IN INCHES, AND DURING THE SUBJECTION OF THE MOLTEN METAL TO VACUUM, REDUCING HEAT TRANSFER FROM THE BATH TO A MINIMUM BY MAINTAINING LITTLE TEMPERATURE DIFFERENTIAL BETWEEN THE UPPER SURFACE OF THE BATH AND A RADIANT HEAT INTERCEPTING SURFACE LOCATED THEREABOVE.
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) | 1967-08-18 | 1968-02-17 | 1968-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-18 | 1972-02-17 | 1972-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-18 | 1976-02-17 | 1976-08-18 | $7700.00 | Window Closed / Lapsed |