US3539997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronizing circuit
Assignee: AT&T Inc
•
Filing: 1962-12-05
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Granted: 1970-11-10
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Expires: 1982-12-05
Abstract
No abstract record available.
Inventors
- 👤 John P Mahony
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:05
CPC Classifications
H; H04; H04L; H04L7/00; H04L7/04; H04L7/08; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/0602; H04J3/0617
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
THE METHOD OF ESTABLISHING WHICH BITS IN A BIT STREAM ARE DATA BITS AND WHICH ARE FRAMING BITS, WHERE THE FRAMING BITS APPEAR IN PREDETERMINED POSITIONS AND HAVE A PREDETERMINED SEQUENCE OF VALUES, COMPRISING THE STEPS OF (1) COMPARING TO ONE ANOTHER THE VALUES OF BITS IN RESPECTIVE BIT POSITIONS IN SUCCESSIVE EQUAL LENGTH GROUPS OF BITS, (2) REGISTERING WHICH RESPECTIVE POSTIONS IN SAID GROUPS OF BITS HAVE A SEQUENCE OF BIT VALUES INCONSISTENT WITH SAID PREDETERMINED FRAMING SEQUENCE AS ASCERTAINED BY REPETITIONS OF THE COMPARING STEP, AND (3) COUNTING THE NUMBER OF SUCCESSIVE BIT POSITIONS IN THE BIT STREAM WHEREIN THE SEQUENCE OF BIT VALUES HAS BEEN ASCERTAINED AS INCONSISTENT WITH THE PREDETERMINED FRAMING SEQUENCE, WHEREBY THE FRAMING BIT POSITIONS ARE ESTABLISHED WHEN THE NUMBER OF SUCCESSIVE BIT POSITIONS COUNTED IS EQUAL TO THE TOTAL NUMBER BETWEEN THE FRAMING BIT POSITIONS.
Claim 2
Independent Claim
142 words
THE METHOD OF ESTABLISHING WHICH BITS IN A BIT STREAM ARE DATA BITS AND WHICH ARE FRAMING BITS, WHERE THE FRAMING BITS APPEAR IN PREDETERMINED POSITIONS AND HAVE A PREDETERMINED SEQUENCE OF VALUES, COMPRISING THE STEPS OF (1) COMPARING TO ONE ANOTHER THE VALUES OF BITS IN RESPECTIVE BIT POSITIONS IN SUCCESSIVE EQUAL LENGTH GROUPS OF BITS, (2) REGISTERING WHICH RESPECTIVE POSTIONS IN SAID GROUPS OF BITS HAVE A SEQUENCE OF BIT VALUES INCONSISTENT WITH SAID PREDETERMINED FRAMING SEQUENCE AS ASCERTAINED BY REPETITIONS OF THE COMPARING STEP, AND (3) COUNTING THE NUMBER OF SUCCESSIVE BIT POSITIONS IN THE BIT STREAM WHEREIN THE SEQUENCE OF BIT VALUES HAS BEEN ASCERTAINED AS INCONSISTENT WITH THE PREDETERMINED FRAMING SEQUENCE, WHEREBY THE FRAMING BIT POSITIONS ARE ESTABLISHED WHEN THE NUMBER OF SUCCESSIVE BIT POSITIONS COUNTED IS EQUAL TO THE TOTAL NUMBER BETWEEN THE FRAMING BIT POSITIONS.
References Cited (Backward Citations)
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Cited
US3229256A
Cited
US3185823A
Cited
US3185824A
Cited
US3213268A
Cited
US3223982A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |