US3188376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode position control in vacuum arc furnace
Assignee: United States Steel Corp
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Filing: 1962-03-29
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Granted: 1965-06-08
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Expires: 1982-03-29
Abstract
No abstract record available.
Inventors
- 👤 Richard E Lyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:32
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: 1
Claim 1
Independent Claim
138 words
IN A VACUUM ARC FURNACE INCLUDING A CRUCIBLE FOR HOLDING A POOL OF MOLTEN METAL, A CONSUMABLE ELECTRODE ADAPTED TO BE MOVED TOWARD AND AWAY FROM THE MOLTEN METAL IN SAID CRUCIBLE, AND A SOURCE OF ELECTRIC CURRENT HAVING ONE LEAD TO THE CRUCIBLE AND A SECOND LEAD TO THE ELECTRODE; A CONTROL FOR POSITIONING SAID ELECTRODE COMPRISING MEANS FOR MOVING SAID ELECTRODE TOWARD AND AWAY FROM SAID MOLTEN METAL, AN AMPLIFIER HAVING ITS OUTPUT CONNECTED TO SAID MEANS FOR MOVING SAID ELECTRODE TOWARD AND AWAY FROM SAID MOLTEN METAL, MEANS PROVIDING TO SAID AMPLIFIER A VOLTAGE PROPORTIONAL TO INCREASES AND DECREASES IN ARC VOLTAGE, AND MEANS PROVENTING THE OPERATION OF SAID AMPLIFIER TO MOVE SAID ELECTRODE AWAY FROM SAID MOLTEN METAL WHEN SAID ARC VOLTAGE DECREASES ARE DUE TO SIDE ARCING OF LESS THAN A PREDETERMINED VALUE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-07 | 1968-12-07 | 1969-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-07 | 1972-12-07 | 1973-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-07 | 1976-12-07 | 1977-06-08 | $7700.00 | Window Closed / Lapsed |