Patent US3223784A successfully refreshed from Google Patents.
US3223784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time division switching system
Assignee: AT&T Inc
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Filing: 1962-04-24
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Granted: 1965-12-14
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Expires: 1982-04-24
Abstract
No abstract record available.
Inventors
- 👤 Inose Hiroshi
- 👤 Kawai Yoichi
- 👤 Koono Zenya
- 👤 Takagi Mikio
- 👤 Yasuda Yasuhiko
- 👤 Yoshida Yuichi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:52
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
A COMMUNICATION SYSTEM COMPRISING A PLURALITY OF LINES INCLUDING ACTIVE LINES COMMUNICATING IN PAIRS, A COMMON TRANSMISSION CHANNEL, SWITCHING MEANS FOR CONNECTING SAID ACTIVE LINES TO SAID CHANNEL IN DISTINCT TIME SLOTS OF A REPETITIVE CYCLE, DELAY MEANS CONNECTED TO SAID CHANNEL TO RECEIVE SUCH SAMPLES AND SUPERVISORY INDICATIONS FROM A CALLING ONE OF SAID ACTIVE LINES IN A FIRST TIME SLOT, MEANS FOR REGISTERING OUTPUTS OF SAID DELAY MEANS IN DISTINCT RECURRING INTERVALS TO DISCRIMINATE BETWEEN SAID SPEECH SAMPLES AND SUPERVISORY INDICATIONS PROVIDED BY SAID FIRST LINE, MEANS CONNECTED TO SAID REGISTERING MEANS FOR RECEIVING THE REGISTERED SUPERVISORY INDICATIONS DESIGNATING A CALLED LINE AND FOR ASSIGNING A SECOND TIME SLOT IN THE RECURRENT CYCLE TO SAID CALLED LINE, AND MEANS FOR TRANSPOSING INFORMATION BETWEEN THE DISTINCT TIME SLOTS ASSIGNED TO SAID CALLING AND CALLED LINES IN COMMUNICATION, SAID LAST-MENTIONED MEANS COMPRISING A DELAY ELEMENT CONNECTED TO SAID CHANNEL TO RECEIVE INFORMATION FROM ONE OF SAID CALLING AND CALLED LINES IN
Claim 2
Dependent Claim
161 words
A COMMUNICATION SYSTEM COMPRISING A PLURALITY OF LINES INCLUDING ACTIVE LINES COMMUNICATING IN PAIRS, A COMMON TRANSMISSION CHANNEL, SWITCHING MEANS FOR CONNECTING SAID ACTIVE LINES TO SAID CHANNEL IN DISTINCT TIME SLOTS OF A REPETITIVE CYCLE, DELAY MEANS CONNECTED TO SAID CHANNEL TO RECEIVE SUCH SAMPLES AND SUPERVISORY INDICATIONS FROM A CALLING ONE OF SAID ACTIVE LINES IN A FIRST TIME SLOT, MEANS FOR REGISTERING OUTPUTS OF SAID DELAY MEANS IN DISTINCT RECURRING INTERVALS TO DISCRIMINATE BETWEEN SAID SPEECH SAMPLES AND SUPERVISORY INDICATIONS PROVIDED BY SAID FIRST LINE, MEANS CONNECTED TO SAID REGISTERING MEANS FOR RECEIVING THE REGISTERED SUPERVISORY INDICATIONS DESIGNATING A CALLED LINE AND FOR ASSIGNING A SECOND TIME SLOT IN THE RECURRENT CYCLE TO SAID CALLED LINE, AND MEANS FOR TRANSPOSING INFORMATION BETWEEN THE DISTINCT TIME SLOTS ASSIGNED TO SAID CALLING AND CALLED LINES IN COMMUNICATION, SAID LAST-MENTIONED MEANS COMPRISING A DELAY ELEMENT CONNECTED TO SAID CHANNEL TO RECEIVE INFORMATION FROM ONE OF SAID CALLING AND CALLED LINES IN
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |