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US2788698A
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Practice piano
Assignee: ELIZABETH CRATON R
•
Filing: 1954-06-17
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Granted: 1957-04-16
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Expires: 1974-06-17
Abstract
No abstract record available.
Inventors
- 👤 Svante T Wickstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:09
CPC Classifications
G; G10; G10C; G10C1/00; G10C3/00; G10C3/12; Y; Y10; Y10S; Y10S84/00; Y10S84/21
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |