US3381090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balanced line driver
Assignee: International Business Machines Corp
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Filing: 1964-10-01
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Granted: 1968-04-30
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Expires: 1984-10-01
Abstract
No abstract record available.
Inventors
- 👤 Carter E Dorrell
- 👤 George J Laurer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:59
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H03; H03K; H03K19/00; H03K19/0175; H03K19/018; H03K19/01806; H03K5/00; H03K5/01; H03K5/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
190 words
DIRECT CURRENT COUPLED TRANSMISSION APPARATUS COMPRISING: A BALANCED LINE DRIVER INCLUDING A SOURCE OF OPERATING POTENTIAL, A PAIR OF TRANSISTORS OF THE SAME CONDUCTIVITY TYPE, EACH HAVING BASE, EMITTER AND COLLECTOR, A SOURCE OF BIVALUED COMPLEMENTARY INPUT SIGNALS, IMPEDANCE MEANS COUPLING THE SOURCE OF INPUT SIGNALS TO THE BASE ELECTRODES OF THE TRANSISTORS TO CAUSE ALTERNATIVE OPERATION OF THE TRANSISTORS AT CUTOFF AND IN SATURATION, SUBSTANTIALLY EQUAL IMPEDANCES COUPLING EACH COLLECTOR AND EACH EMITTER TO THE SOURCE OF POTENTIAL, A FIRST PAIR OF SIMILARLY POLED ZENER DIODES CONNECTED IN SERIES BETWEEN THE COLLECTOR OF ONE TRANSISTOR AND THE EMITTER OF THE OTHER TRANSISTOR AND ENERGIZED IN THEIR REVERSE BREAKDOWN MODE BY THE SOURCE OF OPERATING POTENTIAL, AND A SECOND PAIR OF SIMILARLY POLED ZENER DIODES CONNECTED IN SERIES BETWEEN THE OTHER COLLECTOR AND EMITTER AND ENERGIZED IN THEIR REVERSE BREAKDOWN MODE BY THE SOURCE OF OPERATING POTENTIAL; A TRANSMISSION LINE HAVING A PAIR OF INPUT TERMINALS CONNECTED TO RESPECTIVE JUNCTIONS BETWEEN EACH DIODE PAIR AND HAVING OUTPUT TERMINALS; AND A DIFFERENTIAL AMPLIFIER CONNECTED TO THE OUTPUT TERMINALS AND CONTROLLED BY THE POLARITY OF THE CURRENT FLOW IN THE TRANSMISSION LINE.
Claim 2
Dependent Claim
190 words
DIRECT CURRENT COUPLED TRANSMISSION APPARATUS COMPRISING: A BALANCED LINE DRIVER INCLUDING A SOURCE OF OPERATING POTENTIAL, A PAIR OF TRANSISTORS OF THE SAME CONDUCTIVITY TYPE, EACH HAVING BASE, EMITTER AND COLLECTOR, A SOURCE OF BIVALUED COMPLEMENTARY INPUT SIGNALS, IMPEDANCE MEANS COUPLING THE SOURCE OF INPUT SIGNALS TO THE BASE ELECTRODES OF THE TRANSISTORS TO CAUSE ALTERNATIVE OPERATION OF THE TRANSISTORS AT CUTOFF AND IN SATURATION, SUBSTANTIALLY EQUAL IMPEDANCES COUPLING EACH COLLECTOR AND EACH EMITTER TO THE SOURCE OF POTENTIAL, A FIRST PAIR OF SIMILARLY POLED ZENER DIODES CONNECTED IN SERIES BETWEEN THE COLLECTOR OF ONE TRANSISTOR AND THE EMITTER OF THE OTHER TRANSISTOR AND ENERGIZED IN THEIR REVERSE BREAKDOWN MODE BY THE SOURCE OF OPERATING POTENTIAL, AND A SECOND PAIR OF SIMILARLY POLED ZENER DIODES CONNECTED IN SERIES BETWEEN THE OTHER COLLECTOR AND EMITTER AND ENERGIZED IN THEIR REVERSE BREAKDOWN MODE BY THE SOURCE OF OPERATING POTENTIAL; A TRANSMISSION LINE HAVING A PAIR OF INPUT TERMINALS CONNECTED TO RESPECTIVE JUNCTIONS BETWEEN EACH DIODE PAIR AND HAVING OUTPUT TERMINALS; AND A DIFFERENTIAL AMPLIFIER CONNECTED TO THE OUTPUT TERMINALS AND CONTROLLED BY THE POLARITY OF THE CURRENT FLOW IN THE TRANSMISSION LINE.
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) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |