Patent US3394312A successfully refreshed from Google Patents.
US3394312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for converting two-level signal to three-bit-coded digital signal
Assignee: AT&T Inc
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Filing: 1965-09-08
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Granted: 1968-07-23
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Expires: 1985-09-08
Abstract
No abstract record available.
Inventors
- 👤 Sigmund B Pfeiffer
- 👤 Robert E Yaeger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:49
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/493
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A CODER FOR GENERATING CODE WORDS OF THREE BINARY PULSES DESCRIPTIVE OF A TWO LEVEL SIGNAL COMPRISING MEANS FOR NORMALLY SAMPLING SAID TWO LEVEL SIGNAL AT A RATE TWICE THE PULSE REPETITION RATE OF SAID BINARY PULSES, MEANS FOR STORING THE SAMPLED SIGNAL LEVEL, MEANS FOR PRODUCING A FIRST PULSE OF THE CODE WORD IN RESPONSE TO A CHANGE IN THE STORED LEVEL, MEANS RESPONSIVE TO A CHANGE IN THE STORED LEVEL FOR INHIBITING OPERATION OF THE SAMPLING MEANS FOR AT LEAST FOUR SAMPLINGS, MEANS FOR DETERMINING THE CHARACTERISTIC OF THE SECOND PULSE OF THE CODE WORD IN ACCORDANCE WITH THE OCCURRENCE OF A CHANGE IN STORED LEVEL ON THE RESPECTIVE ODD OR EVEN SAMPLINGS, AND MEANS FOR DETERMINING THE CHARACTERISTIC OF THE THIRD PULSE OF THE CODE WORD IN ACCORDANCE WITH THE STORED LEVEL.
Claim 2
Dependent Claim
135 words
A CODER FOR GENERATING CODE WORDS OF THREE BINARY PULSES DESCRIPTIVE OF A TWO LEVEL SIGNAL COMPRISING MEANS FOR NORMALLY SAMPLING SAID TWO LEVEL SIGNAL AT A RATE TWICE THE PULSE REPETITION RATE OF SAID BINARY PULSES, MEANS FOR STORING THE SAMPLED SIGNAL LEVEL, MEANS FOR PRODUCING A FIRST PULSE OF THE CODE WORD IN RESPONSE TO A CHANGE IN THE STORED LEVEL, MEANS RESPONSIVE TO A CHANGE IN THE STORED LEVEL FOR INHIBITING OPERATION OF THE SAMPLING MEANS FOR AT LEAST FOUR SAMPLINGS, MEANS FOR DETERMINING THE CHARACTERISTIC OF THE SECOND PULSE OF THE CODE WORD IN ACCORDANCE WITH THE OCCURRENCE OF A CHANGE IN STORED LEVEL ON THE RESPECTIVE ODD OR EVEN SAMPLINGS, AND MEANS FOR DETERMINING THE CHARACTERISTIC OF THE THIRD PULSE OF THE CODE WORD IN ACCORDANCE WITH THE STORED LEVEL.
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) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |