US2848690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency selective mode transducers
Assignee: AT&T Inc
•
Filing: 1953-05-27
•
Granted: 1958-08-19
•
Expires: 1973-05-27
Abstract
No abstract record available.
Inventors
- 👤 Stewart E Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:58
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/16; H01P1/163
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2199083A
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US2544923A
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US2445348A
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US2779923A
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US2593155A
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US2706278A
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US2779006A
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US2656513A
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US2643298A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |