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US3515791A
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US
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Piano keying circuit for electrical musical instrument,with selective by-pass circuits for other instrumental effects
Assignee: Thomas International Corp
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Filing: 1966-06-22
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Granted: 1970-06-02
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Expires: 1986-06-22
Abstract
No abstract record available.
Inventors
- 👤 Floyd A Cordry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:41
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; G10H1/053; G10H1/057
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3309454A
Cited
US2906959A
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US3196201A
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US3247306A
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US3389211A
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US3408449A
Cited
US3383453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |