Patent US3164657A successfully refreshed from Google Patents.
US3164657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric furnace construction
Assignee: Allegheny Ludlum Steel Corp
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Filing: 1962-05-28
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Granted: 1965-01-05
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Expires: 1982-05-28
Abstract
No abstract record available.
Inventors
- 👤 Richard B Shaw
- 👤 William G Connor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:40
CPC Classifications
F; F27; F27B; F27B3/00; F27B3/10; F27B3/12; F27D; F27D11/00; F27D11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN A THREE-PHASE ELECTRIC ARC FURNACE COMPOSED OF A STEEL-LIKE SHELL LINED ON ITS INSIDE WALLS WITH REFRACTORY BRICK AND DISPOSED TO RECEIVE THREE ELECTRODES LOWERED FROM THE TOP SO AS TO EFFECT ELECTRIC ARCING BETWEEN A METAL CHARGE WITHIN SAID FURNACE AND SAID ELECTRODES, THE IMPROVEMENT OF PROVIDING AT LEAST ONE OPEININ IN SAID SHELL IN THE AREA ADJACENT AT LEAST ONE OF SAID ELECTRODES, SAID AREA BEING LOCATED AT A HOT SPOT CAUSED BY ARC DEFLECTION SO AS TO PROVIDE AN AIR PASSAGEWAY FROM THE NORMALLY DEAD AIR SPACE BETWEEN THE REFRACTORY BRICK AND THE SHELL TO THE OUTSIDE OF THE FURNACE.
Claim 2
Dependent Claim
104 words
IN A THREE-PHASE ELECTRIC ARC FURNACE COMPOSED OF A STEEL-LIKE SHELL LINED ON ITS INSIDE WALLS WITH REFRACTORY BRICK AND DISPOSED TO RECEIVE THREE ELECTRODES LOWERED FROM THE TOP SO AS TO EFFECT ELECTRIC ARCING BETWEEN A METAL CHARGE WITHIN SAID FURNACE AND SAID ELECTRODES, THE IMPROVEMENT OF PROVIDING AT LEAST ONE OPEININ IN SAID SHELL IN THE AREA ADJACENT AT LEAST ONE OF SAID ELECTRODES, SAID AREA BEING LOCATED AT A HOT SPOT CAUSED BY ARC DEFLECTION SO AS TO PROVIDE AN AIR PASSAGEWAY FROM THE NORMALLY DEAD AIR SPACE BETWEEN THE REFRACTORY BRICK AND THE SHELL TO THE OUTSIDE OF THE FURNACE.
References Cited (Backward Citations)
US1393371A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-01-05 | 1968-07-06 | 1969-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-01-05 | 1972-07-06 | 1973-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-01-05 | 1976-07-06 | 1977-01-05 | $7700.00 | Window Closed / Lapsed |