US2666845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-way communication system
Assignee: Federal Telecommunication Laboratories Inc
•
Filing: 1951-11-28
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Granted: 1954-01-19
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Expires: 1971-11-28
Abstract
No abstract record available.
Inventors
- 👤 Roger B Colton
- 👤 Georges A Deschamps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:42
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/155; H04B7/15528; H04B7/15542; H04B1/00; H04B1/68; H04J; H04J1/00; H04J1/18; H04J3/00; H04J3/02; H04J3/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2375223A
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US2533269A
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US2471416A
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US2543454A
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US2520534A
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US2489273A
Cited
US2477428A
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US2498635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |