US3171370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory sprung arch
Assignee: General Refractories Co
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Filing: 1963-08-09
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Granted: 1965-03-02
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Expires: 1983-08-09
Abstract
No abstract record available.
Inventors
- 👤 Gordon C Fay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:45
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/02; F27D1/025; F23; F23M; F23M5/00; F23M5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A CURVED REFRACTORY SPRUNG ARCH FOR A FURNANCE OR THE LIKE, COMPRISING AN INNER LAYER OF REFRACTORY BRICKS AND AN OUTER LAYER OF REFRACTORY BRICKS, THE REFRACTORY BRICKS IN BOTH THE INNER AND OUTER LAYERS CONVERGING TOWARD THE RADIUS, THE REFRACTORY BRICKS OF BOTH LAYERS BEING ALTERNATELY LONG AND SHORT, THERE BEING A SHORT REFRACTORY BRICK OF ONE LAYER PAIRED WITH A LONG REFRACTORY BRICK OF THE OTHER LAYER AND VICE VERSA, ADJOINING LONG REFRACTORY BRICKS OF THE OUTER LAYER HAVING ADJOINING SURFACES WHICH CONVERGE RADIALLY INWARDLY AND WHICH ENGAGE AND HOLD OPPOSED SURFACES OF A LONG REFRACTORY BRICK OF THE INNER LAYER, AND ADJOINING LONG REFRACTORY BRICKS OF THE INNER LAYER HAVING ADJOINING RADIALLY INWARDLY CONVERGING SURFACES WHICH ENGAGE OPPOSED RADICALLY INWARDLY CONVERGING SURFACES OF A SHORT REFRACTORY BRICK OF THE INNER LAYER, THE SAID INNER AND OUTER LAYERS BEING OF DIFFERENT COMPOSITIONS.
Claim 2
Dependent Claim
144 words
A CURVED REFRACTORY SPRUNG ARCH FOR A FURNANCE OR THE LIKE, COMPRISING AN INNER LAYER OF REFRACTORY BRICKS AND AN OUTER LAYER OF REFRACTORY BRICKS, THE REFRACTORY BRICKS IN BOTH THE INNER AND OUTER LAYERS CONVERGING TOWARD THE RADIUS, THE REFRACTORY BRICKS OF BOTH LAYERS BEING ALTERNATELY LONG AND SHORT, THERE BEING A SHORT REFRACTORY BRICK OF ONE LAYER PAIRED WITH A LONG REFRACTORY BRICK OF THE OTHER LAYER AND VICE VERSA, ADJOINING LONG REFRACTORY BRICKS OF THE OUTER LAYER HAVING ADJOINING SURFACES WHICH CONVERGE RADIALLY INWARDLY AND WHICH ENGAGE AND HOLD OPPOSED SURFACES OF A LONG REFRACTORY BRICK OF THE INNER LAYER, AND ADJOINING LONG REFRACTORY BRICKS OF THE INNER LAYER HAVING ADJOINING RADIALLY INWARDLY CONVERGING SURFACES WHICH ENGAGE OPPOSED RADICALLY INWARDLY CONVERGING SURFACES OF A SHORT REFRACTORY BRICK OF THE INNER LAYER, THE SAID INNER AND OUTER LAYERS BEING OF DIFFERENT COMPOSITIONS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |