US2497331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic volume control for keyboard operated musical instruments
Assignee: Patent Management Inc
•
Filing: 1948-04-26
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Granted: 1950-02-14
•
Expires: 1968-04-26
Abstract
No abstract record available.
Inventors
- 👤 Ellsworth W Swedien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:53
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; G10H1/053; G10H1/055
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1196401A
Cited
US2296125A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |