US3261922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fdm data trunking system having a common tdm supervisory channel
Assignee: AT&T Inc
•
Filing: 1962-12-28
•
Granted: 1966-07-19
•
Expires: 1982-12-28
Abstract
No abstract record available.
Inventors
- 👤 James O Edson
- 👤 Lewis C Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:35
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/204; H04B7/2043; H04L; H04L5/00; H04L5/22; H04L5/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A MULTICHANNEL DATA TRANSMISSION SYSTEM COMPRISING A PLURALITY OF DATA TRUNKING CIRCUITS, EACH PRESENTING A SEPARATE SWITCHHOOK APPEARANCE, A VOICE-BAND TRANSMISSION FACILITY, MEANS FOR DERIVING FROM SAID TRANSMISSION FACILITY A PLURALITY OF ADJACENT NARROW-BAND MESSAGE CHANNELS, ONE FOR EACH OF SAID DATA TRUNKING CIRCUITS, MEANS FOR TRANSLATING THE DATA ON EACH OF SAID TRUNKING CIRCUITS TO THE INDIVIDUAL MESSAGE CHANNELS FORMED BY SAID DERIVING MEANS, MEANS FOR SAMPLING THE SWITCHHOOK APPEARANCES OF SAID TRUNKING CIRCUITS IN TIME SEQUENCE TO FORM A SUPERVISORY SIGNAL PULSE TRAIN, MEANS FOR FURTHER DERIVING FROM SAID TRANSMISSION FACILITY A NARROW-BAND SUPERVISORY SIGNAL CHANNEL ADJACENT TO SAID PLURALITY OF MESSAGE CAHNNELS, AND MEANS FOR MODULATING THE SIGNAL PULSE TRAIN FROM SAID SAMPLING MEANS ONTO SAID SUPERVISORY SIGNAL CHANNEL.
Claim 2
Dependent Claim
122 words
A MULTICHANNEL DATA TRANSMISSION SYSTEM COMPRISING A PLURALITY OF DATA TRUNKING CIRCUITS, EACH PRESENTING A SEPARATE SWITCHHOOK APPEARANCE, A VOICE-BAND TRANSMISSION FACILITY, MEANS FOR DERIVING FROM SAID TRANSMISSION FACILITY A PLURALITY OF ADJACENT NARROW-BAND MESSAGE CHANNELS, ONE FOR EACH OF SAID DATA TRUNKING CIRCUITS, MEANS FOR TRANSLATING THE DATA ON EACH OF SAID TRUNKING CIRCUITS TO THE INDIVIDUAL MESSAGE CHANNELS FORMED BY SAID DERIVING MEANS, MEANS FOR SAMPLING THE SWITCHHOOK APPEARANCES OF SAID TRUNKING CIRCUITS IN TIME SEQUENCE TO FORM A SUPERVISORY SIGNAL PULSE TRAIN, MEANS FOR FURTHER DERIVING FROM SAID TRANSMISSION FACILITY A NARROW-BAND SUPERVISORY SIGNAL CHANNEL ADJACENT TO SAID PLURALITY OF MESSAGE CAHNNELS, AND MEANS FOR MODULATING THE SIGNAL PULSE TRAIN FROM SAID SAMPLING MEANS ONTO SAID SUPERVISORY SIGNAL CHANNEL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-18 | 1970-01-17 | 1970-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-18 | 1974-01-17 | 1974-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-18 | 1978-01-17 | 1978-07-19 | $7700.00 | Window Closed / Lapsed |