US3097252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric arc control
Assignee: Northwestern Steel and Wire Co
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Filing: 1959-12-11
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Granted: 1963-07-09
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Expires: 1979-12-11
Abstract
No abstract record available.
Inventors
- 👤 Charles G Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:46
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/02; H05B7/144; H05B7/148; H05B7/152; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
AN ELECTRIC ARC FURNACE CONTROL SYSTEM FOR CONTROLLING THE POSITION OF AN ELECTRODE IN THE FURNACE COMPRISING CONTROL MEANS NORMALLY OPERATIVE TO MAINTAIN A PREDETERMINED CURRENT-VOLTAGE RELATION AT THE ELECTRODE CORRESPONDING TO A FIRST ARC LENGTH, AND SURGE RESPONSIVE MEANS RESPONSIVE TO A CURRENT SURGE ABOVE A PREDETERMINED VALUE TO ALTER SAID CONTROL MEANS WHEREBY THE CONTROL MEANS TENDS TO MAINTAIN A DIFFERENT CURRENT-VOLTAGE RELATION AT SAID ELECTRODE CORRESPONDING TO A SECOND ARC LENGTH SUBSTANTIALLY GREATER THAN SAID FIRST ARC LENGTH, SAID SURGE RESPONSIVE MEANS INCLUDING TIMING MEANS FOR CONTROLLING THE LENGTH OF TIME WHICH SAID RESPONSIVE MEANS IS OPERATIVE TO ALTER SAID CONTROL MEANS IN THE ABSENCE OF FURTHER CURRENT SURGES.
Claim 2
Dependent Claim
112 words
AN ELECTRIC ARC FURNACE CONTROL SYSTEM FOR CONTROLLING THE POSITION OF AN ELECTRODE IN THE FURNACE COMPRISING CONTROL MEANS NORMALLY OPERATIVE TO MAINTAIN A PREDETERMINED CURRENT-VOLTAGE RELATION AT THE ELECTRODE CORRESPONDING TO A FIRST ARC LENGTH, AND SURGE RESPONSIVE MEANS RESPONSIVE TO A CURRENT SURGE ABOVE A PREDETERMINED VALUE TO ALTER SAID CONTROL MEANS WHEREBY THE CONTROL MEANS TENDS TO MAINTAIN A DIFFERENT CURRENT-VOLTAGE RELATION AT SAID ELECTRODE CORRESPONDING TO A SECOND ARC LENGTH SUBSTANTIALLY GREATER THAN SAID FIRST ARC LENGTH, SAID SURGE RESPONSIVE MEANS INCLUDING TIMING MEANS FOR CONTROLLING THE LENGTH OF TIME WHICH SAID RESPONSIVE MEANS IS OPERATIVE TO ALTER SAID CONTROL MEANS IN THE ABSENCE OF FURTHER CURRENT SURGES.
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) | 1966-07-08 | 1967-01-07 | 1967-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-08 | 1971-01-07 | 1971-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-08 | 1975-01-07 | 1975-07-09 | $7700.00 | Window Closed / Lapsed |