US2737912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace arch
Assignee: Didier Werke AG
•
Filing: 1952-09-23
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Granted: 1956-03-13
•
Expires: 1972-09-23
Abstract
No abstract record available.
Inventors
- 👤 Kauth Karl Hermann
- 👤 Bruchhausen Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:34
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/0003; F27D1/0006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A FURNACE ARCH, PARTICULARLY FOR A SIEMENS-MARTIN FURNACE, SAID ARCH COMPRISING REFRACTORY BRICKS OF DIFFERENT COMPOSITIONS AND MELTING POINTS AND INCLUDING ACID BRICKS AND BASIC BRICKS, WHICH BRICKS WHEN IN CONTACT AT ELEVATED TEMPERATURE REACT AT THE SURFACES OF CONTACT BETWEEN ACID BRICKS AND BASIC BRICKS TO FORM INTERMEDIATE EUTECTIC LAYERS OF LOW MELTING POINT, AND A LAYER OF QUARTZITE INTERPOSED BETWEEN ADJACENT DIFFERENT BRICK SURFACES, SAID QUARTZITE BEING ESSENTIALLY NON-REACTIVE WITH SAID DIFFERENT BRICKS UNDER THE OPERATING TEMPERATURE CONDITIONS OF SAID FURNACE.
Claim 2
Dependent Claim
83 words
A FURNACE ARCH, PARTICULARLY FOR A SIEMENS-MARTIN FURNACE, SAID ARCH COMPRISING REFRACTORY BRICKS OF DIFFERENT COMPOSITIONS AND MELTING POINTS AND INCLUDING ACID BRICKS AND BASIC BRICKS, WHICH BRICKS WHEN IN CONTACT AT ELEVATED TEMPERATURE REACT AT THE SURFACES OF CONTACT BETWEEN ACID BRICKS AND BASIC BRICKS TO FORM INTERMEDIATE EUTECTIC LAYERS OF LOW MELTING POINT, AND A LAYER OF QUARTZITE INTERPOSED BETWEEN ADJACENT DIFFERENT BRICK SURFACES, SAID QUARTZITE BEING ESSENTIALLY NON-REACTIVE WITH SAID DIFFERENT BRICKS UNDER THE OPERATING TEMPERATURE CONDITIONS OF SAID FURNACE.
References Cited (Backward Citations)
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Cited
US1477811A
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US1714506A
Cited
US1686387A
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US2085837A
Cited
US2158759A
Cited
US2236920A
Cited
US2304170A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-13 | 1959-09-12 | 1960-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-13 | 1963-09-12 | 1964-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-13 | 1967-09-12 | 1968-03-13 | $7700.00 | Window Closed / Lapsed |