US2977398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical connection in single-phase electrode furnaces
Assignee: Elektrokemisk AS
•
Filing: 1958-06-30
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Granted: 1961-03-28
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Expires: 1978-06-30
Abstract
No abstract record available.
Inventors
- 👤 Wleugel Johan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:49
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/26; Y; Y02; Y02E; Y02E40/00; Y02E40/50
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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |