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US3513401A
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US
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Circuit arrangements employing active elements therein functioning as circulators,gyrators,inductors or filters
Assignee: Hitachi Ltd
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Filing: 1967-03-31
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Granted: 1970-05-19
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Expires: 1987-03-31
Abstract
No abstract record available.
Inventors
- 👤 Michio Tokunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:13
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/40; H03H11/42; H03H11/38; H03H11/46; H03H11/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2794864A
Cited
US2885492A
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US2954529A
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US3001157A
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US3173098A
Cited
US3300738A
Cited
US3397363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |