US3428886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broad frequency band transformer
Assignee: Fujitsu Ltd
•
Filing: 1966-04-14
•
Granted: 1969-02-18
•
Expires: 1986-04-14
Abstract
No abstract record available.
Inventors
- 👤 Masao Kawashima
- 👤 Yushi Katagiri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:37
CPC Classifications
H; H01; H01F; H01F19/00; H01F19/04; H01F19/06; H03; H03H; H03H7/00; H03H7/38; H03H7/383
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3123781A
Cited
US2470307A
Cited
US2669698A
Cited
US2865006A
Cited
GB811351A
Cited
FR1176024A
Cited
US3114120A
Cited
US3357023A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |