Patent USRE27680E successfully refreshed from Google Patents.
USRE27680E
Expired / Lapsed
US
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Polarity sensitive voltage inserttion circuit for long subscriber loops
Assignee: —
•
Filing: 1971-04-22
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Granted: 1973-06-19
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Expires: 1991-04-22
Abstract
Abstract CIRCUITRY IS DISPOSED WHEREBY A VOLTAGE IN ADDITION TO THAT OF THE CENTRAL OFFICE BATTERY MAY BE INSERTED IN HIGH RESISTANCE TELEPHONE LINES, PARTICULARLY THOSE EMPLOYED IN STEP-BY-STEP CENTRAL OFFICES WHICH EMPLOY REVERSE BATTERY SIGNALING. THE CIRCUITRY SENSES THE INSTANTANEOUS POLARITY OF THE CENTRAL OFFICE BATTERY AND INSERTS THE ADDITIONAL VOLTAGE IN THE LINE WITH THE PROPER POLARITY SO AS TO INCREASE THE APLIED POTENTIAL TO THE LINE.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:47
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/001; H04M19/006
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |