US3274339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time division multiplex transmission systems
Assignee: International Standard Electric Corp
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Filing: 1962-05-09
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Granted: 1966-09-20
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Expires: 1982-05-09
Abstract
No abstract record available.
Inventors
- 👤 Herry Michel Jean
- 👤 Corre Jean Pierre Le
- 👤 Yelloz Guy Ralphael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:40
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/062; H04J3/0626; H04J3/0629; H04Q; H04Q11/00; H04Q11/04; H04Q11/0407
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
214 words
A PULSE CODE MODULATION TIME DIVISION MULTIPLEX TELEPHONE SWITCHING SYSTEM COMPRESING A PLURALITY OF TRUNKLINES INCOMING FROM A DISTANT LOCATION TO AN ASSOCIATED LOCAL TRUNK CIRCUIT, MEANS WHEREBY EACH OF SAID TRUNKLINES CARRY A PLURALITY OF TIME POSITIONED CHANNELS, MEANS FOR TRANSMITTING SAMPLES OF INTELLIGENCE IN PULSE CODE MODULATED FORM OVER SAID LINES DURING DISCRETE TIME CHANNELS, THE TRANSMISSION CHARACTERISTICS OF SAIT LINES SOMETIMES CAUSING TIME FLUCTUATIONS OF SIGNALS IN SAID CHANNELS, MEANS ASSOCIATED WITH EACH OF SAID TRUNKS FOR RECEIVING AND STORING THE PULSE CODE MODULATIONS OF SAID SAMPLES IN LOCATIONS CORRESPONDING TO THE TIME POSITIONS OF CHANNELS CARRYING SAID INTELLIGENCE, A LOCAL CLOCK, MEANS FOR CYCLICALLY CONNECTING EACH INCOMING TRUNKLINE TO A CIRCUIT FOR DETECTING SYNCHRONIZATION VARIATIONS BETWEEN INCOMING SIGNALS AND THE OUTPUT OF SAID LOCAL CLOCK, MEANS IN EACH OF SAID TRUNK CIRCUITS FOR EXTRACTING A TIME REFERENCE SIGNAL FROM EACH OF SAID INCOMING SIGNALS, MEANS FOR COMPARING THE OUTPUT OF SAID LOCAL CLOCK TO THE EXTRACTED TIME SIGNAL, AND MEANS FOR RETIMING THE PULSE CODE MODULATIONS OF INCOMING SIGNAL RESPONSIVE TO A DETECTION OF AN EXCESSIVE TIME FLUCTUATION BETWEEN SAID EXTRACTED REFERENCE SIGNAL AND THE OUTPUT OF SAID LOCAL CLOCK, WHEREBY SAID RECEIVED SIGNAL REAPPEARS IN THE PART OF THE TIME CHANNEL THAT IS RESERVED FOR TRANSMISSION OF SAID INTELLIGENCE.
Claim 2
Dependent Claim
214 words
A PULSE CODE MODULATION TIME DIVISION MULTIPLEX TELEPHONE SWITCHING SYSTEM COMPRESING A PLURALITY OF TRUNKLINES INCOMING FROM A DISTANT LOCATION TO AN ASSOCIATED LOCAL TRUNK CIRCUIT, MEANS WHEREBY EACH OF SAID TRUNKLINES CARRY A PLURALITY OF TIME POSITIONED CHANNELS, MEANS FOR TRANSMITTING SAMPLES OF INTELLIGENCE IN PULSE CODE MODULATED FORM OVER SAID LINES DURING DISCRETE TIME CHANNELS, THE TRANSMISSION CHARACTERISTICS OF SAIT LINES SOMETIMES CAUSING TIME FLUCTUATIONS OF SIGNALS IN SAID CHANNELS, MEANS ASSOCIATED WITH EACH OF SAID TRUNKS FOR RECEIVING AND STORING THE PULSE CODE MODULATIONS OF SAID SAMPLES IN LOCATIONS CORRESPONDING TO THE TIME POSITIONS OF CHANNELS CARRYING SAID INTELLIGENCE, A LOCAL CLOCK, MEANS FOR CYCLICALLY CONNECTING EACH INCOMING TRUNKLINE TO A CIRCUIT FOR DETECTING SYNCHRONIZATION VARIATIONS BETWEEN INCOMING SIGNALS AND THE OUTPUT OF SAID LOCAL CLOCK, MEANS IN EACH OF SAID TRUNK CIRCUITS FOR EXTRACTING A TIME REFERENCE SIGNAL FROM EACH OF SAID INCOMING SIGNALS, MEANS FOR COMPARING THE OUTPUT OF SAID LOCAL CLOCK TO THE EXTRACTED TIME SIGNAL, AND MEANS FOR RETIMING THE PULSE CODE MODULATIONS OF INCOMING SIGNAL RESPONSIVE TO A DETECTION OF AN EXCESSIVE TIME FLUCTUATION BETWEEN SAID EXTRACTED REFERENCE SIGNAL AND THE OUTPUT OF SAID LOCAL CLOCK, WHEREBY SAID RECEIVED SIGNAL REAPPEARS IN THE PART OF THE TIME CHANNEL THAT IS RESERVED FOR TRANSMISSION OF SAID INTELLIGENCE.
References Cited (Backward Citations)
US3029311A
Cited
US3041400A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |