Patent US2602735A successfully refreshed from Google Patents.
US2602735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Making pig iron
Assignee: Individual
•
Filing: 1950-11-09
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Granted: 1952-07-08
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Expires: 1970-11-09
Abstract
No abstract record available.
Inventors
- 👤 John J Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:48
CPC Classifications
C; C21; C21B; C21B11/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
THE PROCESS OF MAKING PIG-IRON FROM HIGHGRADE IRON ORE IN AN OXIDIZING METAL-REFINING FURNACE SUCH AS AN OPEN-HEARTH, WHICH COMPRISES ESTABLISHING AND MAINTAINING ON THE HEARTH OF THE FURNACE A BATH OF MOLTEN PIG-IRON HEATED AT LEAST TO 2700* F. AND COVERED BY A SLAG BLANKET, CONTINUALLY AUGMENTING THE PIG-IRON CONTENT OF THE BATH WITHOUT SUBSTANTIALLYL INCREASING ITS CARBON CONTENT BY SUPPLYING TO THE BATH THROGH ITS SLAG BLANKET PRESSURE-COMPACTED SHAPES CONTAINING FINELY GROUND CARBONBEARING REDUCING MATERIAL AND IRON ORE HAVING AN IRON CONTENT OF AT LEAST 66% WITH BOTH HELD IN INTIMATE ADMIXTURE BY A BINDER FOR EFFECTING ON ENCOUNTERING THE HEAT OF THE BATH REDUCTION OF THE IRON ORE TO IRON BY THE ADMIXED CARBON, AND CONTINUALLY TAPPING OFF RESULTING PIG-IRON YIELDED UNDER OXIDIZING CONDITIONS OTHERWISE PRESENT IN THE FURNACE.
Claim 2
Dependent Claim
132 words
THE PROCESS OF MAKING PIG-IRON FROM HIGHGRADE IRON ORE IN AN OXIDIZING METAL-REFINING FURNACE SUCH AS AN OPEN-HEARTH, WHICH COMPRISES ESTABLISHING AND MAINTAINING ON THE HEARTH OF THE FURNACE A BATH OF MOLTEN PIG-IRON HEATED AT LEAST TO 2700* F. AND COVERED BY A SLAG BLANKET, CONTINUALLY AUGMENTING THE PIG-IRON CONTENT OF THE BATH WITHOUT SUBSTANTIALLYL INCREASING ITS CARBON CONTENT BY SUPPLYING TO THE BATH THROGH ITS SLAG BLANKET PRESSURE-COMPACTED SHAPES CONTAINING FINELY GROUND CARBONBEARING REDUCING MATERIAL AND IRON ORE HAVING AN IRON CONTENT OF AT LEAST 66% WITH BOTH HELD IN INTIMATE ADMIXTURE BY A BINDER FOR EFFECTING ON ENCOUNTERING THE HEAT OF THE BATH REDUCTION OF THE IRON ORE TO IRON BY THE ADMIXED CARBON, AND CONTINUALLY TAPPING OFF RESULTING PIG-IRON YIELDED UNDER OXIDIZING CONDITIONS OTHERWISE PRESENT IN THE FURNACE.
References Cited (Backward Citations)
GB190004896A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-08 | 1956-01-07 | 1956-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-08 | 1960-01-07 | 1960-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-08 | 1964-01-07 | 1964-07-08 | $7700.00 | Window Closed / Lapsed |