Patent US2494691A successfully refreshed from Google Patents.
US2494691A
Expired / Lapsed
US
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Electric wave guide
Assignee: EMI Ltd
•
Filing: 1945-04-18
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Granted: 1950-01-17
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Expires: 1965-04-18
Abstract
No abstract record available.
Inventors
- 👤 Cork Edward Cecil
- 👤 Bowman-Manifold Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:34
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/06; H01P1/062; H01P1/066; H01P1/067; H01P7/00; H01P7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2281274A
Cited
US2155508A
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US2155821A
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US2351895A
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US2401344A
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US2402540A
Cited
US2434925A
Cited
US2407318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-16 | 1953-07-18 | 1954-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-16 | 1957-07-18 | 1958-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-16 | 1961-07-18 | 1962-01-17 | $7700.00 | Window Closed / Lapsed |