Patent EP0086186A1 successfully refreshed from Google Patents.
US3381089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data transmission apparatus
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
- 👤 Richard L Delanoy
- 👤 Donald F Foreman
- 👤 George J Laurer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:10
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
219 words
DIRECT CURRENT COUPLED DATA TRANSMISSION APPARATUS COMPRISING A SOURCE OF BIVALUED DATA SIGNALS REFERENCED ABOUT GROUND IN TRUE AND COMPLEMENTED FORM; A BALANCED DRIVER INCLUDING A FIRST PAIR OF TRANSISTORS OF OPPOSITE CONDUCTIVITY TYPE HAVING BASE AND EMITTER ELECTRODES, MEANS FOR APPLYING THE TRUE DATA SIGNALS TO BOTH BASE ELECTRODES, A SECOND PAIR OF TRANSISTORS OF OPPOSITE CONDUCTIVITY TYPE HAVING BASE AND EMITTER ELECTRODES, AND MEANS FOR APPLYING THE COMPLEMENT DATA SIGNALS TO THE LATTER BASE ELECTRODES; A TRANSMISSION LINE SUBSTANTIALLY LONGER THAN TWO HUNDRED FEET AND HAVING TWO INPUT TERMINALS, TWO OUTPUT TERMINALS, AND A TERMINATING IMPEDANCE, ONE INPUT TERMINAL COUPLED TO THE EMITTER ELECTRODES OF ONE PAIR OF TRANSISTORS AND THE OTHER INPUT TERMINAL COUPLED TO THE EMITTER ELECTRODES OF THE OTHER PAIR OF TRANSISTORS; A LINE TERMINATOR INCLUDING A THIRD PAIR OF TRANSISTORS OF THE SAME CONDUCTIVITY TYPE HAVING EMITTER ELECTRODES COUPLED TO EACH OTHER, BASE ELECTRODES EACH CONNECTED TO A RESPECTIVE TRANSMISSION LINE OUTPUT TERMINAL, AND COLLECTOR ELECTRODES, MEANS INCLUDING A TRANSISTOR PROVIDING A CONSTANT CURRENT SOURCE FOR THE LATTER EMITTER ELECTRODES, AND MEANS OPERATING THE THIRD PAIR OF TRANSISTORS AS A DIFFERENTIAL AMPLIFIER; A LOAD; AND MEANS INCLUDING A TRANSISTOR COUPLED TO ONE OF THE LATTER COLLECTOR ELECTRODES APPLYING SIGNALS TO THE LOAD ALTERNATIVELY AT ONE OR THE OTHER OF TWO CONSTANT CURRENT LEVELS.
Claim 2
Dependent Claim
219 words
DIRECT CURRENT COUPLED DATA TRANSMISSION APPARATUS COMPRISING A SOURCE OF BIVALUED DATA SIGNALS REFERENCED ABOUT GROUND IN TRUE AND COMPLEMENTED FORM; A BALANCED DRIVER INCLUDING A FIRST PAIR OF TRANSISTORS OF OPPOSITE CONDUCTIVITY TYPE HAVING BASE AND EMITTER ELECTRODES, MEANS FOR APPLYING THE TRUE DATA SIGNALS TO BOTH BASE ELECTRODES, A SECOND PAIR OF TRANSISTORS OF OPPOSITE CONDUCTIVITY TYPE HAVING BASE AND EMITTER ELECTRODES, AND MEANS FOR APPLYING THE COMPLEMENT DATA SIGNALS TO THE LATTER BASE ELECTRODES; A TRANSMISSION LINE SUBSTANTIALLY LONGER THAN TWO HUNDRED FEET AND HAVING TWO INPUT TERMINALS, TWO OUTPUT TERMINALS, AND A TERMINATING IMPEDANCE, ONE INPUT TERMINAL COUPLED TO THE EMITTER ELECTRODES OF ONE PAIR OF TRANSISTORS AND THE OTHER INPUT TERMINAL COUPLED TO THE EMITTER ELECTRODES OF THE OTHER PAIR OF TRANSISTORS; A LINE TERMINATOR INCLUDING A THIRD PAIR OF TRANSISTORS OF THE SAME CONDUCTIVITY TYPE HAVING EMITTER ELECTRODES COUPLED TO EACH OTHER, BASE ELECTRODES EACH CONNECTED TO A RESPECTIVE TRANSMISSION LINE OUTPUT TERMINAL, AND COLLECTOR ELECTRODES, MEANS INCLUDING A TRANSISTOR PROVIDING A CONSTANT CURRENT SOURCE FOR THE LATTER EMITTER ELECTRODES, AND MEANS OPERATING THE THIRD PAIR OF TRANSISTORS AS A DIFFERENTIAL AMPLIFIER; A LOAD; AND MEANS INCLUDING A TRANSISTOR COUPLED TO ONE OF THE LATTER COLLECTOR ELECTRODES APPLYING SIGNALS TO THE LOAD ALTERNATIVELY AT ONE OR THE OTHER OF TWO CONSTANT CURRENT LEVELS.
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 |