US2690519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Incandescent screen for projection tubes
Assignee: Farnsworth Research Corp
•
Filing: 1952-09-17
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Granted: 1954-09-28
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Expires: 1972-09-17
Abstract
No abstract record available.
Inventors
- 👤 Christian C Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:30
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US915666A
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US2140994A
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US2098000A
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US2242644A
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US2160022A
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US2171213A
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US2189986A
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US2226384A
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US2280946A
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US2650191A
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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) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |