Patent US2474575A successfully refreshed from Google Patents.
US2474575A
Expired / Lapsed
US
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Heating device for hot cathode tubes
Assignee: Patelhold Patenverwertungs and Elektro-Holding AG
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Filing: 1945-11-08
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Granted: 1949-06-28
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Expires: 1965-11-08
Abstract
No abstract record available.
Inventors
- 👤 Favre Marcel Georges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:23
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/135
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1649016A
Cited
US1763805A
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US2048203A
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US1924462A
Cited
US2159767A
Cited
US2149080A
Cited
US2262044A
Cited
US2236195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-27 | 1952-12-27 | 1953-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-27 | 1956-12-27 | 1957-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-27 | 1960-12-27 | 1961-06-28 | $7700.00 | Window Closed / Lapsed |