US3456546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coincidence circuit and teaching machine for keyboard devices utilizing coincidence circuit and method of operation
Assignee: KIMBALL PIANO AND ORGAN CO
•
Filing: 1966-04-18
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Granted: 1969-07-22
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Expires: 1986-04-18
Abstract
No abstract record available.
Inventors
- 👤 Alan B Welsh
- 👤 Larry William Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:53
CPC Classifications
G; G09; G09B; G09B15/00; G09B15/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2223009A
Cited
US3185865A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |