Patent US3140405A successfully refreshed from Google Patents.
US3140405A
Expired / Lapsed
US
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Digital communications system
Assignee: Unisys Corp
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Filing: 1961-11-13
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Granted: 1964-07-07
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Expires: 1981-11-13
Abstract
No abstract record available.
Inventors
- 👤 John A Kolling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:54
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/12; G; G06; G06F; G06F13/00; G06F13/38; G06F13/40; G06F13/4063; G06F13/4068; G06F13/4072; G06F13/4077
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
178 words
A DIGITAL COMMUNICATIONS SYSTEM FOR TRANSMITTING LOGICAL DATA PULSE SIGNALS BETWEEN EQUIPMENTS, AT HIGH NOISE LEVELS AND HIGH DATA RATES, FROM THE OUTPUT OF ONE OR MORE OF SAID EQUIPMENTS TO THE INPUT OF ONE OR MORE OF SAID EQUIPMENTS COMPRISING A TWISTED PAIR TRANSMISSION LINE, INCLUDING HIGH AND LOW SIGNAL LINES AND HAVING A CHARACTERISTIC LINE CAPACITANCE, BETWEEN AT LEAST ONE OUTPUT AND ONE INPUT OF SAID EQUIPMENTS, AN OUTPUT DRIVER CIRCUIT FOR FEEDING DATA TO THE TRANSMISSION LINE FROM THE SAID ONE OUTPUT AT ONE END OF SAID TRANSMISSION LINE INCLUDING MEANS FOR ALTERNATELY PROVIDING LOW IMPEDANCE CHARGING AND DISCHARGING PATHS, RESPECTIVELY, FOR THE SAID CHARACTERISTIC LINE CAPACITANCE TO THEREBY PROVIDE SUBSTANTIALLY EQUAL CHARGING AND DISCHARGING RATES FOR SAID CAPACITANCE AND AN INPUT AMPLIFIER CIRCUIT FOR FEEDING DATA TO THE ONE INPUT FROM THE SAID TRANSMISSION LNE AT THE OTHER END THEREOF INCLUDING MEANS TO BALANCE OUT NOISE SIGNALS APPEARING ON BOTH SAID HIGH AND LOW LINES AND SIMULTANEOUSLY SEPARATE AND AMPLIFY A DATA SIGNAL APPEARING ON ONE OF SAID LINES FROM THE SAID NOISE SIGNALS.
Claim 2
Dependent Claim
178 words
A DIGITAL COMMUNICATIONS SYSTEM FOR TRANSMITTING LOGICAL DATA PULSE SIGNALS BETWEEN EQUIPMENTS, AT HIGH NOISE LEVELS AND HIGH DATA RATES, FROM THE OUTPUT OF ONE OR MORE OF SAID EQUIPMENTS TO THE INPUT OF ONE OR MORE OF SAID EQUIPMENTS COMPRISING A TWISTED PAIR TRANSMISSION LINE, INCLUDING HIGH AND LOW SIGNAL LINES AND HAVING A CHARACTERISTIC LINE CAPACITANCE, BETWEEN AT LEAST ONE OUTPUT AND ONE INPUT OF SAID EQUIPMENTS, AN OUTPUT DRIVER CIRCUIT FOR FEEDING DATA TO THE TRANSMISSION LINE FROM THE SAID ONE OUTPUT AT ONE END OF SAID TRANSMISSION LINE INCLUDING MEANS FOR ALTERNATELY PROVIDING LOW IMPEDANCE CHARGING AND DISCHARGING PATHS, RESPECTIVELY, FOR THE SAID CHARACTERISTIC LINE CAPACITANCE TO THEREBY PROVIDE SUBSTANTIALLY EQUAL CHARGING AND DISCHARGING RATES FOR SAID CAPACITANCE AND AN INPUT AMPLIFIER CIRCUIT FOR FEEDING DATA TO THE ONE INPUT FROM THE SAID TRANSMISSION LNE AT THE OTHER END THEREOF INCLUDING MEANS TO BALANCE OUT NOISE SIGNALS APPEARING ON BOTH SAID HIGH AND LOW LINES AND SIMULTANEOUSLY SEPARATE AND AMPLIFY A DATA SIGNAL APPEARING ON ONE OF SAID LINES FROM THE SAID NOISE SIGNALS.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |