US2866949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave circulators, isolators, and branching filters
Assignee: AT&T Inc
•
Filing: 1953-10-29
•
Granted: 1958-12-30
•
Expires: 1973-10-29
Abstract
No abstract record available.
Inventors
- 👤 Le Roy C Tillotson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:08
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/32; H01P1/38; H01P1/397
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2231602A
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US2445895A
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US2593120A
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US2643295A
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US2603709A
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US2531447A
Cited
US2679631A
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US2764740A
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US2792551A
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US2755447A
Cited
US2759154A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-29 | 1962-06-30 | 1962-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-29 | 1966-06-30 | 1966-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-29 | 1970-06-30 | 1970-12-30 | $7700.00 | Window Closed / Lapsed |