Patent US2520598A successfully refreshed from Google Patents.
US2520598A
Expired / Lapsed
US
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Tilting type electric induction furnace
Assignee: Babcock and Wilcox Tube Co
•
Filing: 1947-05-08
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Granted: 1950-08-29
•
Expires: 1967-05-08
Abstract
No abstract record available.
Inventors
- 👤 Jr Isaac Harter
- 👤 Sidley O Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:13
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/22; H05B6/24; Y; Y10; Y10S; Y10S266/00; Y10S266/90
Claims Analysis
Total Claims: 0
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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) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |