Patent US5237342A successfully refreshed from Google Patents.
Patent US3716680A successfully refreshed from Google Patents.
US3716680A
Expired / Lapsed
US
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Negative impedance converters suitable for bilateral gain repeaters
Assignee: Nortel Networks Technology Corp
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Filing: 1971-09-30
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Granted: 1973-02-13
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Expires: 1991-09-30
Abstract
Abstract THE REALIZATION OF NOVEL FLOATING AND STABLE NEGATIVE IMPEDANCES UTILIZING OPERATIONAL AMPLIFIERS HAS BEEN ACHIEVED. STABLE BILATERAL GAIN REPEATERS IN TWO PREFERRED CONFIGURATIONS ARE THUS POSSIBLE, WHICH UTILIZE ONLY OPERATIONAL AMPLIFIERS AND RESISTORS.
Inventors
- 👤 J Lim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:18
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/16
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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |