US2871392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Travelling wave tubes
Assignee: International Standard Electric Corp
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Filing: 1955-04-21
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Granted: 1959-01-27
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Expires: 1975-04-21
Abstract
No abstract record available.
Inventors
- 👤 Rogers Douglas Cecil
- 👤 Pohl Walter John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:30
CPC Classifications
H; H01; H01J; H01J3/00; H01J3/02; H01J3/029; C; C07; C07D; C07D261/00; C07D261/02; C07D261/06; C07D261/10; C07D261/18; C07D317/00; C07D317/08; C07D317/44; C07D317/46; C07D317/48; C07D317/62; C07D317/66; G; G05; G05D; G05D16/00; G05D16/04; G05D16/0404; G05D23/00; G05D23/01; G05D23/12; G05D23/125; G09; G09F; G09F7/00; H01F; H01F7/00; H01F7/02; H01F7/0273; H01F7/0278; H01J23/00; H01J23/02; H01J23/06; H01J23/065; H01J23/08; H01J23/087; H01J23/0873; H01J23/36; H01J23/40; H01J23/42; H01J25/00; H01J25/34; H01J25/36; H01J25/38; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/38
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) | 1962-01-26 | 1962-07-28 | 1963-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-26 | 1966-07-28 | 1967-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-26 | 1970-07-28 | 1971-01-27 | $7700.00 | Window Closed / Lapsed |