Patent US2974295A successfully refreshed from Google Patents.
US2974295A
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Frequency addition and subtraction by means of auxiliary deflection electrodes in a cathode ray tube
Assignee: Individual
•
Filing: 1957-04-29
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Granted: 1961-03-07
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Expires: 1977-04-29
Abstract
No abstract record available.
Inventors
- 👤 Rydbeck Olof Erik Hans
- 👤 Stenhardt Carl Marten Eugen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:52
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/14; G06G7/16; H; H01; H01J; H01J31/00; H01J31/02; H01J31/04; H03; H03B; H03B21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB328680A
Cited
US2185684A
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US2290651A
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US2507170A
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US2551024A
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US2560772A
Cited
US2547397A
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US2533401A
Cited
US2809352A
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 |