US2517138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Immersible electrodynamic loud-speaker
Assignee: RCA Corp
•
Filing: 1944-06-29
•
Granted: 1950-08-01
•
Expires: 1964-06-29
Abstract
No abstract record available.
Inventors
- 👤 John D Seabert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:28
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1247825A
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US1186961A
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US1523964A
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US1923959A
Cited
US2276022A
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US2400281A
Cited
US2346429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-31 | 1954-01-30 | 1954-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-31 | 1958-01-30 | 1958-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-31 | 1962-01-30 | 1962-08-01 | $7700.00 | Window Closed / Lapsed |