US2402392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic sound-transmission apparatus
Assignee: Radio Patents Corp
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Filing: 1942-10-06
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Granted: 1946-06-18
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Expires: 1962-10-06
Abstract
No abstract record available.
Inventors
- 👤 Goldschmidt Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:28
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/60; H04R25/604; H04R25/606; H04R11/00; H04R11/02; H04R2460/00; H04R2460/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-06-17 | 1949-12-17 | 1950-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-06-17 | 1953-12-17 | 1954-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-06-17 | 1957-12-17 | 1958-06-18 | $7700.00 | Window Closed / Lapsed |