Patent US2790147A successfully refreshed from Google Patents.
US2790147A
Expired / Lapsed
US
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Reactance tube circuitry
Assignee: VITRO Corp
•
Filing: 1953-10-23
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Granted: 1957-04-23
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Expires: 1973-10-23
Abstract
No abstract record available.
Inventors
- 👤 Armstrong Albert Claude
- 👤 Kee Joseph Warren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:58
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/10; H03C3/12; H03C3/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2248132A
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US2324282A
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US2378245A
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US2350171A
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US2356483A
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US2445508A
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US2424830A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |