US3506932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quadrature hybrid coupler
Assignee: AT&T Inc
•
Filing: 1968-02-28
•
Granted: 1970-04-14
•
Expires: 1988-02-28
Abstract
No abstract record available.
Inventors
- 👤 Henry R Beurrier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:55
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/12; H01P5/16; H01P5/18; H01P5/184; H01P5/187
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2854645A
Cited
US2951218A
Cited
US3063026A
Cited
US3345585A
Cited
US3452300A
Cited
US3452301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-13 | 1973-10-13 | 1974-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-13 | 1977-10-13 | 1978-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-13 | 1981-10-13 | 1982-04-14 | $7700.00 | Window Closed / Lapsed |