US3142019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unbalanced-to-balanced amplifier
Assignee: AT&T Inc
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Filing: 1961-10-11
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Granted: 1964-07-21
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Expires: 1981-10-11
Abstract
No abstract record available.
Inventors
- 👤 David L Favin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:22
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/26
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
121 words
AN AMPLIFIER COMPRISING MEANS RECEIVING UNBALANCED ELECTRIC SIGNALS AND REPRODUCING THOSE SIGNALS AT TWO OUTPUT CONNECTIONS AT DIFFERENT DIRECT POTENTIAL LEVELS, SAID RECEIVING MEANS INCLUDING A SIGNAL BYPASS CONNECTED TO SAID OUTPUT CONNECTIONS SO THAT EACH OF SAID CONNECTIONS OPERATES AT ESSENTIALLY THE SAME SIGNAL LEVEL AS THE OTHER, TWO AMPLIFIER OUTPUT TERMINALS, MEANS COUPLING THE REPRODUCED ELECTRIC SIGNALS AT EACH OF SAID RECEIVING MEANS OUTPUT CONNECTIONS TO A DIFFERENT ONE OF SAID AMPLIFIER OUTPUT TERMINALS, SAID COUPLING MEANS INCLUDING MEANS ADJUSTING THE RELATIVE AMPLITUDES OF SIGNAL VARIATIONS AT SAID OUTPUT TERMINALS, AND SAID RECEIVING MEANS INCLUDING MEANS ADJUSTING THE DIRECT POTENTIAL DIFFERENCE BETWEEN SAID DIRECT POTENTIAL LEVELS FOR ADJUSTING THE RELATIVE MAGNITUDE OF THE DIRECT POTENTIALS AT SAID OUTPUT TERMINALS.
References Cited (Backward Citations)
US2618711A
Cited
US2850650A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-21 | 1968-01-20 | 1968-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-21 | 1972-01-20 | 1972-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-21 | 1976-01-20 | 1976-07-21 | $7700.00 | Window Closed / Lapsed |