US2885492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Repeater systems employing non-reciprocal coupling devices
Assignee: AT&T Inc
•
Filing: 1952-08-30
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Granted: 1959-05-05
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Expires: 1972-08-30
Abstract
No abstract record available.
Inventors
- 👤 Heedene Albert R D
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:50
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/002; H04; H04B; H04B3/00; H04B3/02; H04B3/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2169360A
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US2647239A
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US2496266A
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US2629024A
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US2697759A
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US2649574A
Cited
US2748353A
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US2774890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |