US3269827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preheating the charge to an electric smelting furnace
Assignee: Elektrokemisk AS
•
Filing: 1963-03-05
•
Granted: 1966-08-30
•
Expires: 1983-03-05
Abstract
No abstract record available.
Inventors
- 👤 Arnesen Arne Georg
- 👤 Basen Toralv
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:45
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/003; C01B25/01; C01B32/00; C01B32/90; C21; C21B; C21B13/00; C21B13/14; H; H10; H10N; H10N10/00; H10N10/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
THE METHOD OF PEHEATING THE CHARGE TO AN ELECTRIC SMELTING FURNACE IN A PREHEATING SHAFT OF THE TYPE HAVING AN ANNULAR COMBUSTION SPACE THAT SURROUNDS THE CHARGE THEREIN AND COMMUNICATES DIRECTLY WITH INERIORLY EXPOSED SURFACE PORTIONS OF THE CHARGE IN SAID SHAFT WHICH COMPIRSES THE STEPS OF FEEDING A SOLID PARTICULATE CHARGE FREE OF SOLID CARBONACEOUS REDUCING AGENT INTO THE TOP OF THE SHAFT, SUPPLYING FURNACE REACTION GAS INTO THE ANNULAR COMBUSTION SPACE, COMBUSTING THE GAS IN SUCH SPACE TO PRODUCE HOT COMUSTION GAS ADJACENT SAID INTERIORLY EXPOSED SURFACE PORTIONS OF THE CHARGE AND PASSING SAID HOT COMBUSTION GAS INTO SAID INTERIOLY EXPOSED SURFACE PORTONS AND UPWARDLY THROUGH THE DESCENDING CHARGE IN THE SHAFT TO PREHEAT THE CHARGE.
Claim 2
Independent Claim
118 words
THE METHOD OF PEHEATING THE CHARGE TO AN ELECTRIC SMELTING FURNACE IN A PREHEATING SHAFT OF THE TYPE HAVING AN ANNULAR COMBUSTION SPACE THAT SURROUNDS THE CHARGE THEREIN AND COMMUNICATES DIRECTLY WITH INERIORLY EXPOSED SURFACE PORTIONS OF THE CHARGE IN SAID SHAFT WHICH COMPIRSES THE STEPS OF FEEDING A SOLID PARTICULATE CHARGE FREE OF SOLID CARBONACEOUS REDUCING AGENT INTO THE TOP OF THE SHAFT, SUPPLYING FURNACE REACTION GAS INTO THE ANNULAR COMBUSTION SPACE, COMBUSTING THE GAS IN SUCH SPACE TO PRODUCE HOT COMUSTION GAS ADJACENT SAID INTERIORLY EXPOSED SURFACE PORTIONS OF THE CHARGE AND PASSING SAID HOT COMBUSTION GAS INTO SAID INTERIOLY EXPOSED SURFACE PORTONS AND UPWARDLY THROUGH THE DESCENDING CHARGE IN THE SHAFT TO PREHEAT THE CHARGE.
References Cited (Backward Citations)
US772354A
Cited
US1440546A
Cited
US826742A
Cited
US996492A
Cited
US1177680A
Cited
US1725763A
Cited
US2515764A
Cited
US2978315A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |