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US2968771A
Expired / Lapsed
US
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Step-twist junction waveguide filter
Assignee: AT&T Inc
•
Filing: 1957-12-31
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Granted: 1961-01-17
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Expires: 1977-12-31
Abstract
No abstract record available.
Inventors
- 👤 Jr Bernard C De Loach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:49
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/207; H01P1/208
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2473834A
Cited
US2423130A
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US2736867A
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US2541375A
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US2634332A
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BE510704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-17 | 1964-07-18 | 1965-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-17 | 1968-07-18 | 1969-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-17 | 1972-07-18 | 1973-01-17 | $7700.00 | Window Closed / Lapsed |