Patent US3308431A successfully refreshed from Google Patents.
US3308431A
Expired / Lapsed
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Distortion correction circuitry for data transmission systems
Assignee: International Business Machines Corp
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Filing: 1963-09-30
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Granted: 1967-03-07
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Expires: 1983-09-30
Abstract
No abstract record available.
Inventors
- 👤 Hopner Emil
- 👤 Howard L Funk
- 👤 Dale L Critchlow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:32
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03019; H04L25/03038; H04L25/03114; H04L25/03127
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
IN A DATA TRANSMISSION SYSTEM INCLUDING TRANSMITTER MEANS FOR PRODUCING A TEST PULSE, AND TRANSMISSION MEANS CONNECTED TO SAID TRANSMITTER MEANS FOR TRANSMITTING AND DISTORTING SAID PULSE SO THAT A WAVEFORM IS PROVIDED HAVING THE SHAPE OF A MAIN PEAK AND TRAILING PEAKS OF LESSER AMPLITUDE, THE COMBINATION THEREWITH OF A RECEIVER CONNECTED TO RECEIVE THE WAVEFORM PROVIDED BY SAID TRANSMISSION MEANS, SAID RECEIVER COMPRISING: SAMPLING MEANS FOR SAMPLING SAID MAIN PEAK AND AT LEAST ONE POINT IN THE TRAILING PORTION OF SAID WAVEFORM; AND CANCELING MEANS FOR ADDING A SELECTED QUANTITY OF THE SAMPLE OF SAID MAIN PEAK TO THE SAMPLE OF SAID TRAILING PORTION OF SAID WAVEFORM, SAID QUANTITY BEING SELECTED SO THAT THE RESULT OF SAID ADDITION APPROACHES ZERO.
Claim 2
Dependent Claim
122 words
IN A DATA TRANSMISSION SYSTEM INCLUDING TRANSMITTER MEANS FOR PRODUCING A TEST PULSE, AND TRANSMISSION MEANS CONNECTED TO SAID TRANSMITTER MEANS FOR TRANSMITTING AND DISTORTING SAID PULSE SO THAT A WAVEFORM IS PROVIDED HAVING THE SHAPE OF A MAIN PEAK AND TRAILING PEAKS OF LESSER AMPLITUDE, THE COMBINATION THEREWITH OF A RECEIVER CONNECTED TO RECEIVE THE WAVEFORM PROVIDED BY SAID TRANSMISSION MEANS, SAID RECEIVER COMPRISING: SAMPLING MEANS FOR SAMPLING SAID MAIN PEAK AND AT LEAST ONE POINT IN THE TRAILING PORTION OF SAID WAVEFORM; AND CANCELING MEANS FOR ADDING A SELECTED QUANTITY OF THE SAMPLE OF SAID MAIN PEAK TO THE SAMPLE OF SAID TRAILING PORTION OF SAID WAVEFORM, SAID QUANTITY BEING SELECTED SO THAT THE RESULT OF SAID ADDITION APPROACHES ZERO.
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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |