US3449696A
Expired / Lapsed
US
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Dual section all pass lattice filter wherein nonlinearities of two sections cancel
Assignee: CLAUDE C ROUTH
•
Filing: 1965-04-12
•
Granted: 1969-06-10
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Expires: 1985-04-12
Abstract
No abstract record available.
Inventors
- 👤 Claude C Routh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:04
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/18; H03H7/21
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1600290A
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US1989545A
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US1828454A
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US2024900A
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US2249415A
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US2342638A
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US2922128A
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US3122716A
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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 |