Patent US3370196A successfully refreshed from Google Patents.
US3370196A
Expired / Lapsed
US
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Envelope geometry for a magnetically controllable field effect tube
Assignee: US Philips Corp
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Filing: 1965-04-30
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Granted: 1968-02-20
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Expires: 1985-04-30
Abstract
No abstract record available.
Inventors
- 👤 Dorgelo Eduard Gerhardus
- 👤 Green Bertram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:57
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/02; H01J21/18; H01J19/00; H01J19/42; H01J19/46; H01J2893/00; H01J2893/0001; H01J2893/0002; H01J2893/0005; H01J2893/0006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-19 | 1971-08-21 | 1972-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-19 | 1975-08-21 | 1976-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-19 | 1979-08-21 | 1980-02-20 | $7700.00 | Window Closed / Lapsed |