US2761909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multifrequency oscillator
Assignee: AT&T Inc
•
Filing: 1953-01-28
•
Granted: 1956-09-04
•
Expires: 1973-01-28
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert L Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:22
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02; H04M19/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2150241A
Cited
US2279319A
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US2569347A
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US2591914A
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US2561768A
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US2589800A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |