US2779225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyboard attachment for electrically operated musical instruments
Assignee: Individual
•
Filing: 1953-06-01
•
Granted: 1957-01-29
•
Expires: 1973-06-01
Abstract
No abstract record available.
Inventors
- 👤 Carlson Emil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:23
CPC Classifications
G; G10; G10D; G10D15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1073044A
Cited
US1168846A
Cited
US1233148A
Cited
US1288658A
Cited
US1347977A
Cited
US1852066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |