US3071458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of adding charge material to molten metal under vacuum
Assignee: Finkl A and Sons Co
•
Filing: 1960-05-09
•
Granted: 1963-01-01
•
Expires: 1980-05-09
Abstract
No abstract record available.
Inventors
- 👤 Charles W Finkl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:05
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A METHOD OF REDUCING HEAT LOSS FROM, AND SUBSTANTIALLY ELIMINATING THE REABSORPTION OF DELETERIOUS GASES BY, A FERROUS MELT SUBJECTED TO VACUUM TREATMENT IN A RECEPTACLE, SAID METHOD INCLUDING THE STEPS OF SUBJECTING THE SURFACE OF THE MELT TO A VACUUM AND MAINTAINING THE AFORESAID VACUUM UNTIL A SUBSTANTIAL QUANTITY OF THE INDLUDED DELETERIOUS GASES HAVE BEEN REMOVED FROM THE MELT, THEREAFTER, ADDING CHARGE MATERIAL CONTAINING AT LEAST A SUBSTANTIAL QUANTITY OF SLAG-FORMING MATERIAL TO THE MELT, ALL THE WHILE MAINTAINING THE AFORESAID VACUUM ABOVE THE SURFACE OF THE MELT, AND THEREAFTER, SUBJECTING THE CHARGE MATERIAL WHICH HAS BEEN ADDED TO THE MELT, INCLUDING THE SLAG FORMED THEREFROM, TO THE VACUUM FOR A PERIOD OF TIME SUFFICIENT TO REMOVE INCLUDED DELETERIOUS GASES FROM THE CHARGE MATERIAL.
Claim 2
Independent Claim
126 words
A METHOD OF REDUCING HEAT LOSS FROM, AND SUBSTANTIALLY ELIMINATING THE REABSORPTION OF DELETERIOUS GASES BY, A FERROUS MELT SUBJECTED TO VACUUM TREATMENT IN A RECEPTACLE, SAID METHOD INCLUDING THE STEPS OF SUBJECTING THE SURFACE OF THE MELT TO A VACUUM AND MAINTAINING THE AFORESAID VACUUM UNTIL A SUBSTANTIAL QUANTITY OF THE INDLUDED DELETERIOUS GASES HAVE BEEN REMOVED FROM THE MELT, THEREAFTER, ADDING CHARGE MATERIAL CONTAINING AT LEAST A SUBSTANTIAL QUANTITY OF SLAG-FORMING MATERIAL TO THE MELT, ALL THE WHILE MAINTAINING THE AFORESAID VACUUM ABOVE THE SURFACE OF THE MELT, AND THEREAFTER, SUBJECTING THE CHARGE MATERIAL WHICH HAS BEEN ADDED TO THE MELT, INCLUDING THE SLAG FORMED THEREFROM, TO THE VACUUM FOR A PERIOD OF TIME SUFFICIENT TO REMOVE INCLUDED DELETERIOUS GASES FROM THE CHARGE MATERIAL.
References Cited (Backward Citations)
BE554400A
Cited
US493047A
Cited
US2550735A
Cited
US2763480A
Cited
US2871533A
Cited
US2784961A
Cited
US2726952A
Cited
US2788270A
Cited
US2929704A
Cited
US2895820A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-31 | 1966-07-02 | 1967-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-31 | 1970-07-02 | 1971-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-31 | 1974-07-02 | 1975-01-01 | $7700.00 | Window Closed / Lapsed |