Patent US916885A successfully refreshed from Google Patents.
US3020501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveguides
Assignee: EMI Ltd
•
Filing: 1957-05-10
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Granted: 1962-02-06
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Expires: 1977-05-10
Abstract
No abstract record available.
Inventors
- 👤 Cole Roy Stanley
- 👤 Honeyman William Neil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:46
CPC Classifications
H; H03; H03C; H03C7/00; H03C7/02; H03C7/022; H01; H01P; H01P1/00; H01P1/18; H01P1/19; H01P7/00; H01P7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2197123A
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US2557261A
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FR980648A
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US2650350A
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US2784382A
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US2760162A
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US2773254A
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US2857575A
Cited
US2887665A
Cited
US2848695A
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US2848696A
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US2900557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |