US3079450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace refractory structures
Assignee: Strategic Materials Corp
•
Filing: 1959-05-12
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Granted: 1963-02-26
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Expires: 1979-05-12
Abstract
No abstract record available.
Inventors
- 👤 Frank C Senior
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:33
CPC Classifications
F; F27; F27B; F27B3/00; F27B3/10; F27B3/12; F27B3/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A FURNACE HEARTH STRUCTURE FOR USE IN A STATIONARY FURNACE THAT COMPRISES AN INVERTED CIRCULAR ARCH FORMED OF A PLURALITY OF INDIVIDUAL REFRACTORY UNITS AND HAVING A REFRACTORY SKEWBACK TERMINATING ONE END OF SAID ARCH POSITIONED AT AN ELEVATED HEIGHT ON THE FURNACE WALL WITH THE REFRACTORY SKEWBACK TERMINATING THE OPPOSITE END OF SAID ARCH BEING POSITIONED SLIGHTLY ABOVE THE LOWERMOST
Claim 2
Dependent Claim
61 words
A FURNACE HEARTH STRUCTURE FOR USE IN A STATIONARY FURNACE THAT COMPRISES AN INVERTED CIRCULAR ARCH FORMED OF A PLURALITY OF INDIVIDUAL REFRACTORY UNITS AND HAVING A REFRACTORY SKEWBACK TERMINATING ONE END OF SAID ARCH POSITIONED AT AN ELEVATED HEIGHT ON THE FURNACE WALL WITH THE REFRACTORY SKEWBACK TERMINATING THE OPPOSITE END OF SAID ARCH BEING POSITIONED SLIGHTLY ABOVE THE LOWERMOST
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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) | 1966-02-25 | 1966-08-27 | 1967-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-25 | 1970-08-27 | 1971-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-25 | 1974-08-27 | 1975-02-26 | $7700.00 | Window Closed / Lapsed |