Patent US5523243A successfully refreshed from Google Patents.
US3448409A
Expired / Lapsed
US
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Integrated microwave circulator and filter
Assignee: AT&T Inc
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Filing: 1967-11-24
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Granted: 1969-06-03
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Expires: 1987-11-24
Abstract
No abstract record available.
Inventors
- 👤 Louis F Moose
- 👤 Masahiro Omori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:42
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/02; H01P3/08; H01P3/081; H01P1/00; H01P1/20; H01P1/213; H01P1/2135; H01P1/32; H01P1/38; H01P1/383; H01P1/387; H01P7/00; H01P7/08; H01P7/084
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2984802A
Cited
US3339158A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |