Patent US3204048A successfully refreshed from Google Patents.
US3204048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative impedance repeaters for non-loaded lines
Assignee: AT&T Inc
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Filing: 1961-09-29
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Granted: 1965-08-31
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Expires: 1981-09-29
Abstract
No abstract record available.
Inventors
- 👤 Monte Robert W De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:24
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/16; H04B3/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
117 words
IN COMBINATION WITH A TWO-WIRE TRANSMISSION LINE CARRYING A PREDETERMINED BAND OF FREQUENCIES, A TWOTERMINAL IMPEDANCE DEVICE, A TRANSFORMER HAVING AT LEAST THREE MUTUALLY COUPLED WINDINGS, MEANS CONNECTING A PAIR OF SAID WINDINGS IN SERIES WITH ONE SIDE OF SAID LINE, MEANS CONNECTING A THIRD OF SAID WINDINGS ACROSS SAID IMPEDANCE DEVICE, AND A CAPACITOR CONNECTED FROM THE JUNCTION BETWEEN SAID PAIR OF WINDINGS TO THE OTHER SIDE OF SAID LINE, WHEREBY THE IMPEDANCE PRESENTED TO SAID THIRD WINDING BY SAID IMPEDANCE DEVICE APPEARS EFFECTIVELY IN SERIES WITH SAID LINE FOR FREQUENCIES AT THE LOW FREQUENCY END OF SAID BAND AND EFFECTIVELY IN SHUNT ACROSS SAID LINE FOR FREQUENCIES AT THE HIGH FREQUENCY END OF SAID BAND.
References Cited (Backward Citations)
US2747165A
Cited
GB738319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |