Patent US2933643A successfully refreshed from Google Patents.
US2933643A
Expired / Lapsed
US
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Travelling wave magnetrons
Assignee: MO Valve Co Ltd
•
Filing: 1955-03-24
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Granted: 1960-04-19
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Expires: 1975-03-24
Abstract
No abstract record available.
Inventors
- 👤 Robertshaw Robert Gibson
- 👤 Willshaw William Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:40
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/50; H01J25/52; H01J25/58; H01J25/587
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2639403A
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US2666869A
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US2683238A
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US2775721A
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US2858472A
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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) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |