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Patent US3449704A successfully refreshed from Google Patents.
US3449704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impedance transformer for vhf bands
Assignee: TDK Corp
•
Filing: 1967-03-16
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Granted: 1969-06-10
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Expires: 1987-03-16
Abstract
No abstract record available.
Inventors
- 👤 Mitsuo Matsushima
- 👤 Tadaharu Akino
- 👤 Shigeru Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:15
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/42; H03H7/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1748857A
Cited
US2594890A
Cited
US2826747A
Cited
US3195076A
Cited
US3230488A
Cited
US3327220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |