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US3247404A
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US
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Electro-mechanical transducer
Assignee: Telefunken AG
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Filing: 1958-02-13
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Granted: 1966-04-19
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Expires: 1978-02-13
Abstract
No abstract record available.
Inventors
- 👤 Batsch Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:15
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/20; H10N30/204; H10N30/2041; H10N30/2042; H10N30/2046; H04; H04R; H04R17/00; H04R17/04; H04R17/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2478223A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |