Patent US3566294A successfully refreshed from Google Patents.
US3566294A
Expired / Lapsed
US
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Sound effect amplifier
Assignee: Individual
•
Filing: 1968-10-18
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Granted: 1971-02-23
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Expires: 1988-10-18
Abstract
Abstract A SOUND EFFECT AMPLIFIER COMPRISING AN AMPLIFIER CIRCUIT, A PLURALITY OF SERIES RESONANCE CIRCUITS CONNECTED IN PARALLEL RELATION TO ONE ANOTHER AND FORMING TOGETHER WITH SAID AMPLIFIER CIRCUIT A DEVICE FOR DIVIDING AN INPUT SIGNAL INTO RESPECTIVE FREQUENCY BANDS AND FOR AMPLIFYING OR ATTENUATING THE RESPECTIVE FREQUENCY BANDS, AND A DAMPING RESISTANCE DISPOSED IN SERIES IN EACH OF SAID SERIES RESONANCE CIRCUITS WHEREBY INCREASE OF DECREASE OF THE GAIN IS CARRIED OUT SEPARATELY FOR EACH OF THE FREQUENCY BANDS OR SIMULTANEOUSLY FOR ALL OF THEM.
Inventors
- 👤 Nobuaki Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:44
CPC Classifications
H; H03; H03G; H03G5/00; H03G5/02; H03G5/025
Claims Analysis
Total Claims: 0
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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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |