US2974274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary-emission cathode-ray tube and engine analyzer employing the same
Assignee: Lindberg AS
•
Filing: 1955-12-13
•
Granted: 1961-03-07
•
Expires: 1975-12-13
Abstract
No abstract record available.
Inventors
- 👤 Jr John E Lindberg
- 👤 Leslie J Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:02
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/121; F; F02; F02P; F02P17/00; F02P17/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB328680A
Cited
US2250528A
Cited
US2374666A
Cited
US2406982A
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US2438709A
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US2535055A
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US2491390A
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US2518427A
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US2503949A
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US2502132A
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US2537150A
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US2645751A
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US2700151A
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US2700626A
Cited
US2740069A
Cited
US2787760A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |