Patent US3384844A successfully refreshed from Google Patents.
US3384844A
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Negative impedance device
Assignee: AT&T Inc
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Filing: 1965-06-14
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Granted: 1968-05-21
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Expires: 1985-06-14
Abstract
No abstract record available.
Inventors
- 👤 Larned A Meacham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:38
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/62; H03H; H03H11/00; H03H11/02; H03H11/40; H03H11/44; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/16; H04B3/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2101699A
Cited
US2864062A
Cited
US2904758A
Cited
US2904641A
Cited
US3144620A
Cited
US3223849A
Cited
US3322972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-21 | 1971-11-20 | 1972-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-21 | 1975-11-20 | 1976-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-21 | 1979-11-20 | 1980-05-21 | $7700.00 | Window Closed / Lapsed |