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Patent US2993943A successfully refreshed from Google Patents.
US2993943A
Expired / Lapsed
US
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Low frequency electric induction furnaces
Assignee: Individual
•
Filing: 1958-10-23
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Granted: 1961-07-25
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Expires: 1978-10-23
Abstract
No abstract record available.
Inventors
- 👤 Cooke Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:47
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/16; H05B6/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE22602E
Cited
USRE22948E
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US1069923A
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US1453097A
Cited
US2633414A
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US2643022A
Cited
US2453946A
Cited
US2767962A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |