US3588310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piano tone simulation system with piezoelectric generator
Assignee: TWCA CORP
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Filing: 1969-03-26
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Granted: 1971-06-28
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Expires: 1989-03-26
Abstract
Abstract A PIANO ACTION INCLUDING A HAMMER HAVING A FELT HEAD, THE HAMMER STRIKING A PIEZOELECTRIC GENERATOR WHICH GENERATES A DC ELECTRIC POTENTIAL PROPORTIONAL TO THE FORCE OF THE HAMMER BLOW. THE POTENTIAL GENERATED MOMENTARILY TURNS ON TO CHARGE A CAPACITOR. THE CAPACITOR THEN DISCHARGES IN ACCORDANCE WITH A RESISTOR TO PROVIDE A WAVE ENVELOPE SIMULATING THAT OF A CONVENTIONAL PIANO.
Inventors
- 👤 Eric Gschwandtner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:14
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; G10H1/053; G10H1/055; G10H1/0556
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |