US2546840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wave guide phase shifter
Assignee: AT&T Inc
•
Filing: 1945-04-26
•
Granted: 1951-03-27
•
Expires: 1965-04-26
Abstract
No abstract record available.
Inventors
- 👤 Warren A Tyrrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:13
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/18; H01P1/182; H01P1/165; H01P1/17; H01P1/173
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2207845A
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US2317503A
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US2433368A
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US2464269A
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US2438119A
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US2425345A
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US2411534A
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US2430130A
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US2422058A
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US2427100A
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US2479650A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-26 | 1954-09-25 | 1955-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-26 | 1958-09-25 | 1959-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-26 | 1962-09-25 | 1963-03-27 | $7700.00 | Window Closed / Lapsed |