Patent US2551807A successfully refreshed from Google Patents.
US2551807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic musical instrument
Assignee: RCA Corp
•
Filing: 1944-11-07
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Granted: 1951-05-08
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Expires: 1964-11-07
Abstract
No abstract record available.
Inventors
- 👤 Jr Frederic D Merrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:44
CPC Classifications
H; H04; H04R; H04R19/00; H04R19/02; G; G10; G10H; G10H3/00; G10H3/12; G10H3/14; G10H3/18; G10H3/182; Y; Y10; Y10S; Y10S84/00; Y10S84/21
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2027074A
Cited
US2220350A
Cited
US2318936A
Cited
US2444218A
Cited
US2413062A
Cited
US2323231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |