Patent US2457787A successfully refreshed from Google Patents.
US2457787A
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Assignee: Farnsworth Research Corp
•
Filing: 1944-06-02
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Granted: 1948-12-28
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Expires: 1964-06-02
Abstract
No abstract record available.
Inventors
- 👤 John A Stagnaro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:38
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/06; H01J43/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1699011A
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US1923552A
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US1981115A
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US2078304A
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US2051693A
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GB478262A
Cited
US2252752A
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US2257942A
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US2264630A
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US2315288A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |