US2676392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making filamentary electromagnetic transducers
Assignee: AT&T Inc
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Filing: 1952-12-05
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Granted: 1954-04-27
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Expires: 1972-12-05
Abstract
No abstract record available.
Inventors
- 👤 Frederick G Buhrendorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:41
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/17; G11B5/1272; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/4906; Y10T29/49064; Y10T29/49073
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1647474A
Cited
US1767715A
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US2066511A
Cited
US2230913A
Cited
US2538405A
Cited
US2616994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |