Patent US2958719A successfully refreshed from Google Patents.
US2958719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of metal
Assignee: National Research Corp
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Filing: 1958-09-18
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Granted: 1960-11-01
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Expires: 1978-09-18
Abstract
No abstract record available.
Inventors
- 👤 Beecher Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:42
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/02; F; F27; F27D; F27D11/00; F27D11/08; H05B7/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
AN ARC FURNACE FOR SKULL MELTING A REFRACTORY METAL SUCH AS TITANIUM AND THE LIKE WHICH COMPRISES A GAS-TIGHT HOUSING, MEANS FOR CREATING A SUBSTANTIALLY INERT ATMOSPHERE WITHIN SAID HOUSING, A FIRST CRUCIBLE FOR HOLDING A MASS OF REFRACTORY METAL WITHIN A SOLID SKULL OF SAID REFRACTORY METAL, MEANS FOR TILTING SAID FIRST CRUCIBLE, AT LEAST ONE ELECTRODE MEANS FOR CREATING A METAL-MELTING ARC TO THE METAL TO BE MELTED IN SAID FIRST CRUCIBLE, GROUNDING MEANS FOR SAID FIRST CRUCIBLE COMPRISING A SECOND CRUCIBLE BELOW SAID FIRST CRUCIBLE FOR HOLDING A MASS OF LOW-MELTING METAL, BUS-BAR MEANS CONNECTED TO SAID SECOND CRUCIBLE FOR CONDUCTING CURRENT THEREFROM, MEANS FOR INITIALLY HEATING SAID SECOND CRUCIBLE, MEANS FOR COOLING SAID MASS OF LOW-MELTING METAL, AND A SUBSTANTIALLY LARGE METALLIC CONNECTOR MEANS EXTENDING FROM
Claim 2
Dependent Claim
130 words
AN ARC FURNACE FOR SKULL MELTING A REFRACTORY METAL SUCH AS TITANIUM AND THE LIKE WHICH COMPRISES A GAS-TIGHT HOUSING, MEANS FOR CREATING A SUBSTANTIALLY INERT ATMOSPHERE WITHIN SAID HOUSING, A FIRST CRUCIBLE FOR HOLDING A MASS OF REFRACTORY METAL WITHIN A SOLID SKULL OF SAID REFRACTORY METAL, MEANS FOR TILTING SAID FIRST CRUCIBLE, AT LEAST ONE ELECTRODE MEANS FOR CREATING A METAL-MELTING ARC TO THE METAL TO BE MELTED IN SAID FIRST CRUCIBLE, GROUNDING MEANS FOR SAID FIRST CRUCIBLE COMPRISING A SECOND CRUCIBLE BELOW SAID FIRST CRUCIBLE FOR HOLDING A MASS OF LOW-MELTING METAL, BUS-BAR MEANS CONNECTED TO SAID SECOND CRUCIBLE FOR CONDUCTING CURRENT THEREFROM, MEANS FOR INITIALLY HEATING SAID SECOND CRUCIBLE, MEANS FOR COOLING SAID MASS OF LOW-MELTING METAL, AND A SUBSTANTIALLY LARGE METALLIC CONNECTOR MEANS EXTENDING FROM
References Cited (Backward Citations)
US2371278A
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US2625719A
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US2789150A
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US2789152A
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US2796452A
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US2825641A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-01 | 1964-05-02 | 1964-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-01 | 1968-05-02 | 1968-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-01 | 1972-05-02 | 1972-11-01 | $7700.00 | Window Closed / Lapsed |