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US2517425A
Expired / Lapsed
US
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Arrangement of electronic discharge tube equipment for the thermal treatment of metals by high-frequency currents
Assignee: Societe Francaise Radio Electrique
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Filing: 1945-10-29
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Granted: 1950-08-01
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Expires: 1965-10-29
Abstract
No abstract record available.
Inventors
- 👤 Grumel Henri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:47
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1687656A
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US1759603A
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US1946876A
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US2151035A
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US2318468A
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US2349813A
Cited
US2348338A
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US2343453A
Cited
US2321189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-31 | 1954-01-30 | 1954-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-31 | 1958-01-30 | 1958-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-31 | 1962-01-30 | 1962-08-01 | $7700.00 | Window Closed / Lapsed |