US2674031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making electromagnetic transducers
Assignee: AT&T Inc
•
Filing: 1952-12-05
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Granted: 1954-04-06
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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
2026-10-25 16:11
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/1272; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49048; Y10T29/4906; Y10T29/49071; Y10T29/49073
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2464029A
Cited
US2592652A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-05 | 1957-10-05 | 1958-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-05 | 1961-10-05 | 1962-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-05 | 1965-10-05 | 1966-04-06 | $7700.00 | Window Closed / Lapsed |