US2557261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency electric transmission lines or wave guides
Assignee: EMI Ltd
•
Filing: 1945-07-21
•
Granted: 1951-06-19
•
Expires: 1965-07-21
Abstract
No abstract record available.
Inventors
- 👤 Collard John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:47
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/16; H01P1/162
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2407318A
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US2438119A
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US2464598A
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US2417820A
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US2429200A
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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) | 1954-06-18 | 1954-12-18 | 1955-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-18 | 1958-12-18 | 1959-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-18 | 1962-12-18 | 1963-06-19 | $7700.00 | Window Closed / Lapsed |