Patent US2530818A successfully refreshed from Google Patents.
US2530818A
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US
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Variable phase shifter for circularly polarized microwaves
Assignee: AT&T Inc
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Filing: 1945-08-17
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Granted: 1950-11-21
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Expires: 1965-08-17
Abstract
No abstract record available.
Inventors
- 👤 Fox Arthur Gardner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:42
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/165; H01P1/17; H01P1/18; H01P1/182
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2429601A
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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) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |