US2834943A
Expired / Lapsed
US
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Mechanically coupled electromechanical and magnetomechanical transducers
Assignee: AT&T Inc
•
Filing: 1953-09-16
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Granted: 1958-05-13
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Expires: 1973-09-16
Abstract
No abstract record available.
Inventors
- 👤 Richard O Grisdale
- 👤 John H Rowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:12
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/002; H03C; H03C1/00; H03C1/46; H01; H01F; H01F21/00; H01F21/02; H01F21/08
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) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |