US2742616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative impedance repeaters
Assignee: AT&T Inc
•
Filing: 1950-10-23
•
Granted: 1956-04-17
•
Expires: 1970-10-23
Abstract
No abstract record available.
Inventors
- 👤 Jr Josiah L Merrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:15
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/16; H03; H03F; H03F3/00; H03F3/50; H03F3/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2057998A
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US2088439A
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US1971919A
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US2220770A
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US2236690A
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US2274347A
Cited
GB515762A
Cited
GB516358A
Cited
FR864127A
Cited
US2499423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |