US2155508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wave guide impedance element and network
Assignee: AT&T Inc
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Filing: 1936-12-04
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Granted: 1939-04-25
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Expires: 1956-12-04
Abstract
No abstract record available.
Inventors
- 👤 Sergel A Schelkunoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:54
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/207; H01P1/209; H01P1/22; H01P1/222; H01P1/24; H01P1/26; H01P1/264
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-04-24 | 1942-10-24 | 1943-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-04-24 | 1946-10-24 | 1947-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-04-24 | 1950-10-24 | 1951-04-25 | $7700.00 | Window Closed / Lapsed |