Patent US2716221A successfully refreshed from Google Patents.
US2716221A
Expired / Lapsed
US
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Rotatable dielectric slab phase-shifter for waveguide
Assignee: Individual
•
Filing: 1950-09-25
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Granted: 1955-08-23
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Expires: 1970-09-25
Abstract
No abstract record available.
Inventors
- 👤 Philip J Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:11
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/18; H01P1/182
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2197123A
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US2433368A
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US2438119A
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US2567748A
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US2546840A
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US2495415A
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GB604076A
Cited
US2602895A
Cited
US2483933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-08-22 | 1959-02-21 | 1959-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-22 | 1963-02-21 | 1963-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-22 | 1967-02-21 | 1967-08-23 | $7700.00 | Window Closed / Lapsed |