US2209667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of transmission in two-way signaling systems
Assignee: AT&T Inc
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Filing: 1939-05-13
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Granted: 1940-07-30
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Expires: 1959-05-13
Abstract
No abstract record available.
Inventors
- 👤 Charles C Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:06
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/40; H04B; H04B3/00; H04B3/02; H04B3/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-07-30 | 1944-01-29 | 1944-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-07-30 | 1948-01-29 | 1948-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-07-30 | 1952-01-29 | 1952-07-30 | $7700.00 | Window Closed / Lapsed |