Patent US2537723A successfully refreshed from Google Patents.
US2537723A
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Electromagnetic transducer
Assignee: TRUVOX ENGINEERING Co Ltd
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Filing: 1947-11-18
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Granted: 1951-01-09
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Expires: 1967-11-18
Abstract
No abstract record available.
Inventors
- 👤 Ward Leslie Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:23
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/025; H04R2209/00; H04R2209/022; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49826; Y10T29/49908; Y10T29/49915; Y10T29/49917; Y10T29/49918; Y10T29/49925; Y10T29/49934
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1808297A
Cited
US1951531A
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US2025087A
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US1987413A
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AU328331A
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US2085721A
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US1986856A
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US2025127A
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US2091011A
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US2395166A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |