Patent US2931934A successfully refreshed from Google Patents.
US2931934A
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US
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Indirectly heated supply cathode
Assignee: Egyesuelt Izzolampa es Villamossagi Rt
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Filing: 1956-02-01
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Granted: 1960-04-05
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Expires: 1976-02-01
Abstract
No abstract record available.
Inventors
- 👤 Budincsevits Andor
- 👤 Winter Erno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:25
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1891074A
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US2175345A
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US2177703A
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US2543728A
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US2624024A
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US2761993A
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US2700118A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |