Patent US2679545A successfully refreshed from Google Patents.
US2679545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amgient temf-jo
Assignee: —
•
Filing: —
•
Granted: 1954-05-25
•
Expires: 1971-05-25
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:33
CPC Classifications
F; F27; F27D; F27D11/00; F27D11/02; F27D99/00; F27D99/0001; F27D99/0006; H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/141; H05B3/62; F27D2099/0008; H05B2203/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A HIGH TEMPERATURE RESISTOR FOR AN ELECTRIC FURNACE COMPRISING A TUBULAR ELEMENT OF REFRACTORY OXIDE SELECTED FROM THE GROUP CONSISTING OF ZIRCONIA AND THORIA, STABILIZED, CONTAINING FROM 3% TO 6% OF ALKALINE OXIDE SELECTED FROM THE GROUP CONSISTING OF LIME AND MAGNESIA, SAID TUBULAR ELEMENT BEING OF SUBSTANTIALLY UNIFORM CROSS SECTION THROUGHOUT ITS EFFECTIVE LENGTH AND HAVING A WALL THICKNESS NOT GREATER THAN THAT AT WHICH, THROUGHTOUT THE DESIRED OPERATING TEMPERATURES AND IN RESPONSE TO CURRENT FLOW THEREIN, HEAT IS GENERATED INTERNALLY OF THE WALL MASS OF SAID STABILIZED REFRACTORY OXIDE AT A RATE GREATER THAN THE RATE AT WHICH SAID TUBULAR ELEMENT LOSES
Claim 2
Dependent Claim
104 words
A HIGH TEMPERATURE RESISTOR FOR AN ELECTRIC FURNACE COMPRISING A TUBULAR ELEMENT OF REFRACTORY OXIDE SELECTED FROM THE GROUP CONSISTING OF ZIRCONIA AND THORIA, STABILIZED, CONTAINING FROM 3% TO 6% OF ALKALINE OXIDE SELECTED FROM THE GROUP CONSISTING OF LIME AND MAGNESIA, SAID TUBULAR ELEMENT BEING OF SUBSTANTIALLY UNIFORM CROSS SECTION THROUGHOUT ITS EFFECTIVE LENGTH AND HAVING A WALL THICKNESS NOT GREATER THAN THAT AT WHICH, THROUGHTOUT THE DESIRED OPERATING TEMPERATURES AND IN RESPONSE TO CURRENT FLOW THEREIN, HEAT IS GENERATED INTERNALLY OF THE WALL MASS OF SAID STABILIZED REFRACTORY OXIDE AT A RATE GREATER THAN THE RATE AT WHICH SAID TUBULAR ELEMENT LOSES
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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) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |