Patent US3394511A successfully refreshed from Google Patents.
US3394511A
Expired / Lapsed
US
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Refractory construction
Assignee: NATIONAL REFRACTORIES & MINERALS Corp A CORP OF
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Filing: 1964-11-27
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Granted: 1968-07-30
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Expires: 1984-11-27
Abstract
No abstract record available.
Inventors
- 👤 Bernard D Mckenna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:52
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/04; F27B; F27B3/00; F27B3/10; F27B3/12; F27B3/16; F27D1/0003; F27D1/0023; F27D1/045; F27D2001/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A REFRACTORY UNIT COMPRISING: A REFRACTORY SHAPE HAVING AN INNER END ADAPTED TO BE EXPOSED TO THE HIGH TEMPERATURES OF A FURNACE, AN OUTER END OPPOSITE SAID INNER END, AND LONGITUDINAL FACES BETWEEN SAID ENDS; COMBUSTIBLE MATERIAL ON AT LEAST ONE OF TWO OPPOSED LONGITUDINAL FACES OF THE REFRACTORY ADJACENT THE INNER END OF THE REFRACTORY; AND FLAT SHEET METAL ATTACHED TO AT LEAST ONE OF SAID TWO OPPOSED LONGITUDINAL FACES OF SAID REFRACTORY SHAPE AT THE OUTER END OF SAID SHAPE AND EXTENDING FROM ADJACENT SAID OUTER END TO FROM 10* TO 25* OF THE DISTANCE FROM THE OUTER END TOWARD THE INNER END OF THE SHAPE, SAID METAL REMAINING SOLID AT TEMPERATURES PREVAILING AT THE OUTER END OF THE SHAPE.
Claim 2
Dependent Claim
122 words
A REFRACTORY UNIT COMPRISING: A REFRACTORY SHAPE HAVING AN INNER END ADAPTED TO BE EXPOSED TO THE HIGH TEMPERATURES OF A FURNACE, AN OUTER END OPPOSITE SAID INNER END, AND LONGITUDINAL FACES BETWEEN SAID ENDS; COMBUSTIBLE MATERIAL ON AT LEAST ONE OF TWO OPPOSED LONGITUDINAL FACES OF THE REFRACTORY ADJACENT THE INNER END OF THE REFRACTORY; AND FLAT SHEET METAL ATTACHED TO AT LEAST ONE OF SAID TWO OPPOSED LONGITUDINAL FACES OF SAID REFRACTORY SHAPE AT THE OUTER END OF SAID SHAPE AND EXTENDING FROM ADJACENT SAID OUTER END TO FROM 10* TO 25* OF THE DISTANCE FROM THE OUTER END TOWARD THE INNER END OF THE SHAPE, SAID METAL REMAINING SOLID AT TEMPERATURES PREVAILING AT THE OUTER END OF THE SHAPE.
References Cited (Backward Citations)
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Cited
GB468341A
Cited
US2180969A
Cited
US2296392A
Cited
FR884686A
Cited
CH236203A
Cited
US2829877A
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US3086327A
Cited
US3073067A
Cited
US3324810A
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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) | 1971-07-30 | 1972-01-29 | 1972-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-30 | 1976-01-29 | 1976-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-30 | 1980-01-29 | 1980-07-30 | $7700.00 | Window Closed / Lapsed |