US3524006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling arc discharge in plasma arc furnaces
Assignee: Qualitäts- und Edelstah-Kombinat VEB
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Filing: 1967-10-19
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Granted: 1970-08-11
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Expires: 1987-10-19
Abstract
No abstract record available.
Inventors
- 👤 Fred Ebeling
- 👤 Werner Jakobs
- 👤 Erich Mumme
- 👤 Herbert Hoffmann
- 👤 Helmfried Jeske
- 👤 Karl Spiegelberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:36
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/02
Claims Analysis
Total Claims: 0
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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) | 1973-08-10 | 1974-02-09 | 1974-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-10 | 1978-02-09 | 1978-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-10 | 1982-02-09 | 1982-08-11 | $7700.00 | Window Closed / Lapsed |