Patent US2530251A successfully refreshed from Google Patents.
US2530251A
Expired / Lapsed
US
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Piano construction for sound amplification
Assignee: Individual
•
Filing: 1945-08-09
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Granted: 1950-11-14
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Expires: 1965-08-09
Abstract
No abstract record available.
Inventors
- 👤 Luberoff Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:45
CPC Classifications
G; G10; G10H; G10H3/00; G10H3/12; G10H3/14; G10H3/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1681161A
Cited
US1739680A
Cited
US2001722A
Cited
US1915177A
Cited
US2078385A
Cited
GB491985A
Cited
US2200718A
Cited
US2219539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-13 | 1954-05-15 | 1954-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-13 | 1958-05-15 | 1958-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-13 | 1962-05-15 | 1962-11-14 | $7700.00 | Window Closed / Lapsed |