US2641757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic multichannel selection
Assignee: AT&T Inc
•
Filing: 1950-05-17
•
Granted: 1953-06-09
•
Expires: 1970-05-17
Abstract
No abstract record available.
Inventors
- 👤 Daniel F Hoth
- 👤 Robert O Soffel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:50
CPC Classifications
H; H04; H04W; H04W72/00; H04W72/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1608551A
Cited
US2265056A
Cited
US2383908A
Cited
US2479701A
Cited
US2475675A
Cited
US2501091A
Cited
US2458558A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |