US3013229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gyromagnetic microwave filter devices
Assignee: AT&T Inc
•
Filing: 1958-11-17
•
Granted: 1961-12-12
•
Expires: 1978-11-17
Abstract
No abstract record available.
Inventors
- 👤 Grasse Robert W De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:22
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/215; H01P1/218
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2809354A
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US2777906A
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US2866949A
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US2922125A
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US2755447A
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US2850705A
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US2873370A
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FR1149584A
Cited
FR1169581A
Cited
US2883629A
Cited
FR1169700A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-11 | 1965-06-12 | 1965-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-11 | 1969-06-12 | 1969-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-11 | 1973-06-12 | 1973-12-12 | $7700.00 | Window Closed / Lapsed |