US2991449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selector circuit
Assignee: AT&T Inc
•
Filing: 1957-08-14
•
Granted: 1961-07-04
•
Expires: 1977-08-14
Abstract
No abstract record available.
Inventors
- 👤 Bock W Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:12
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/50; H04M3/51; H04M3/523; H04Q; H04Q3/00; H04Q3/0008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2574904A
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US2719670A
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US2686838A
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US2614176A
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US2840708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |