Patent US2830274A successfully refreshed from Google Patents.
US2830274A
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US
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Electromechanical transducer
Assignee: General Electric Co
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Filing: 1954-06-29
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Granted: 1958-04-08
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Expires: 1974-06-29
Abstract
No abstract record available.
Inventors
- 👤 Charles A Rosen
- 👤 Keith A Fish
- 👤 Herbert C Rothenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:27
CPC Classifications
H; H02; H02M; H02M5/00; H03; H03H; H03H9/00; H03H9/46; H03H9/54; H03H9/56; H03H9/562; H10; H10N; H10N30/00; H10N30/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |