Patent US4902456A successfully refreshed from Google Patents.
Patent US3555462A successfully refreshed from Google Patents.
US3555462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveguide-slow wave structure impedance matching device
Assignee: NEC Corp
•
Filing: 1967-11-17
•
Granted: 1971-01-12
•
Expires: 1987-11-17
Abstract
Abstract AN IMPEDANCE MATCHING DEVICE FOR MATCHING A LOADED WAVEGUIDE TYPE SLOW-WAVE STRUCTURE AND AN EXTERNAL WAVEGUIDE DIVIDED BY A PARTITION WALL INCLUDING A COUPLING SLOT COUPLING LOOP PAIR IN THE PARTITION WALL, THE DIMENSIONS OF THE COUPLING LOOP BEING VARIED TO VARY THE IMPEDANCE.
Inventors
- 👤 Toshinori Horigome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:18
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/02; H01J; H01J23/00; H01J23/36
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |