Patent US2439665A successfully refreshed from Google Patents.
US2439665A
Expired / Lapsed
US
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Sound reproducing device
Assignee: RCA Corp
•
Filing: 1944-01-31
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Granted: 1948-04-13
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Expires: 1964-01-31
Abstract
No abstract record available.
Inventors
- 👤 John F Marquis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:05
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/16; H04R7/18; H04R7/20; H04R2307/00; H04R2307/201
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE459929C
Cited
GB296493A
Cited
US1738853A
Cited
US1859782A
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US1832608A
Cited
US2269284A
Cited
US2302178A
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US2325117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-13 | 1951-10-13 | 1952-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-13 | 1955-10-13 | 1956-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-13 | 1959-10-13 | 1960-04-13 | $7700.00 | Window Closed / Lapsed |