US2789150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat reservoir and electrode for production of metals in skull type furnace
Assignee: National Research Corp
•
Filing: 1955-05-25
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Granted: 1957-04-16
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Expires: 1975-05-25
Abstract
No abstract record available.
Inventors
- 👤 Philip J Clough
- 👤 John L Ham
- 👤 David I Sinizer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:34
CPC Classifications
C; C22; C22B; C22B4/00; C22B4/08; F; F27; F27D; F27D11/00; F27D11/08; H; H05; H05B; H05B7/00; H05B7/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
AN IMPROVEMENT ARC FURNACE FOR SKULL MELTING A REACTIVE METAL, SUCH AS TITANIUM AND THE LIKE, SAID FURNACE COMRISING IN COMBINATION A GAS-TIGHT HOUSING, A METALHOLDING CURCIBLE OF A SIZE SUFFICIENTLY LARGE TO HOLD A PREDETERMINED QUANTILY OF A MOLTEN REACTIVE METAL WITHIN A SOLID SKULL OF SAID REACTIVE METAL, AT LEAST ONE ELECTRODE MEANS FOR CREATING A METAL-MELTING ARC TO THE METAL TO BE MELTED IN THE CRUCIBLE AND A SOLID HEAT RESERVOIR MEANS IN HEAT TRANSFER RELATIONSHIP TO THE ELECTRODE MEANS, SAID HEAT RESERVOIR MEANS HAVING SUFFICIENT MASS TO STORE ON THE ORDER OF 20 PERCENT OF THE AMOUNT OF HEATED REQUIRED TO MELT SAID PREDETERMINED QUANTITY OF METAL, THE MASS OF THE SOLID HEAT RESERVOIR MEANS BEING AT LEAST FOUR TIMES THE MASS OF SAID PREDETERMINED QUANTITY MOLTEN METAL.
Claim 2
Dependent Claim
132 words
AN IMPROVEMENT ARC FURNACE FOR SKULL MELTING A REACTIVE METAL, SUCH AS TITANIUM AND THE LIKE, SAID FURNACE COMRISING IN COMBINATION A GAS-TIGHT HOUSING, A METALHOLDING CURCIBLE OF A SIZE SUFFICIENTLY LARGE TO HOLD A PREDETERMINED QUANTILY OF A MOLTEN REACTIVE METAL WITHIN A SOLID SKULL OF SAID REACTIVE METAL, AT LEAST ONE ELECTRODE MEANS FOR CREATING A METAL-MELTING ARC TO THE METAL TO BE MELTED IN THE CRUCIBLE AND A SOLID HEAT RESERVOIR MEANS IN HEAT TRANSFER RELATIONSHIP TO THE ELECTRODE MEANS, SAID HEAT RESERVOIR MEANS HAVING SUFFICIENT MASS TO STORE ON THE ORDER OF 20 PERCENT OF THE AMOUNT OF HEATED REQUIRED TO MELT SAID PREDETERMINED QUANTITY OF METAL, THE MASS OF THE SOLID HEAT RESERVOIR MEANS BEING AT LEAST FOUR TIMES THE MASS OF SAID PREDETERMINED QUANTITY MOLTEN METAL.
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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) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |