Patent US2821880A successfully refreshed from Google Patents.
US2821880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piano playing device
Assignee: —
•
Filing: —
•
Granted: 1958-02-04
•
Expires: 1975-02-04
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:30
CPC Classifications
G; G10; G10F; G10F1/00; G10F1/02; G10H; G10H2240/00; G10H2240/171; G10H2240/281; G10H2240/311
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US430066A
Cited
US507703A
Cited
US1107495A
Cited
US1107558A
Cited
US1058902A
Cited
US1152841A
Cited
US1122468A
Cited
US1219063A
Cited
US1496617A
Cited
US1530123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-03 | 1961-08-05 | 1962-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-03 | 1965-08-05 | 1966-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-03 | 1969-08-05 | 1970-02-04 | $7700.00 | Window Closed / Lapsed |