US2929704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of and apparatus for degasifying metals
Assignee: Dortmund Hoerder Huettenunion AG
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Filing: 1957-01-14
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Granted: 1960-03-22
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Expires: 1977-01-14
Abstract
No abstract record available.
Inventors
- 👤 Harders Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:44
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
A DISCONTINUOUS PROCESS FOR THE DEGASIFICATION OF MOLTEN METALS COMPRISING MAINTAINING A SUBSTANTAILLY CONSTANT, SUBATMOSPHERIC PRESSURE IN A VACUM ZONE PROVIDED WITH A MOLTEN METAL INTERCONNECTING PASSAGEWAY, MAINTAINING A BATH OF MOLTEN METAL IN ADJUSTABLE RELATIONSHIP WITH RESPECT TO SAID ZONE, FLOWING SAID METAL INTO SAID ZONE BY IMMERSING SAID PASSAGEWAY IN SAID BATH AND REDUCING THE DISTANCE BETWEEN SAID ZONE AND SAID BATH TO SUCH EXTENT THAT ONLY A PORTION OF THE METAL IS DRAWN INTO SAID VACUUM ZONE, DEGASIFYING SAID METAL PORTION IN SAID ZONE BY THE APPLICATION OF SAID SUBSTANTIALLY CONSTANT, SUBATMOSPHERIC PRESSURE THERETO, INCREASING THE DISTANCE BETWEEN SAID BATH AND SAID ZONE TO DISCHARGE THE DEGASIFIED METAL PORTION FROM SAID ZONE TO SAID BATH, AND SUCCESSIVELY REPEATING THE STEPS OF DECREASING AND INCREASING THE DISTANCE BETWEEN SAID BATH AND SAID ZONE UNTIL THE METAL IN SAID BATH IS BROUGHT TO THE DESIRED DEGREE OF PURITY.
Claim 2
Dependent Claim
149 words
A DISCONTINUOUS PROCESS FOR THE DEGASIFICATION OF MOLTEN METALS COMPRISING MAINTAINING A SUBSTANTAILLY CONSTANT, SUBATMOSPHERIC PRESSURE IN A VACUM ZONE PROVIDED WITH A MOLTEN METAL INTERCONNECTING PASSAGEWAY, MAINTAINING A BATH OF MOLTEN METAL IN ADJUSTABLE RELATIONSHIP WITH RESPECT TO SAID ZONE, FLOWING SAID METAL INTO SAID ZONE BY IMMERSING SAID PASSAGEWAY IN SAID BATH AND REDUCING THE DISTANCE BETWEEN SAID ZONE AND SAID BATH TO SUCH EXTENT THAT ONLY A PORTION OF THE METAL IS DRAWN INTO SAID VACUUM ZONE, DEGASIFYING SAID METAL PORTION IN SAID ZONE BY THE APPLICATION OF SAID SUBSTANTIALLY CONSTANT, SUBATMOSPHERIC PRESSURE THERETO, INCREASING THE DISTANCE BETWEEN SAID BATH AND SAID ZONE TO DISCHARGE THE DEGASIFIED METAL PORTION FROM SAID ZONE TO SAID BATH, AND SUCCESSIVELY REPEATING THE STEPS OF DECREASING AND INCREASING THE DISTANCE BETWEEN SAID BATH AND SAID ZONE UNTIL THE METAL IN SAID BATH IS BROUGHT TO THE DESIRED DEGREE OF PURITY.
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) | 1963-03-22 | 1963-09-21 | 1964-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-22 | 1967-09-21 | 1968-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-22 | 1971-09-21 | 1972-03-22 | $7700.00 | Window Closed / Lapsed |