Patent US3231679A successfully refreshed from Google Patents.
US3231679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone switching network
Assignee: AT&T Inc
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Filing: 1962-06-28
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Granted: 1966-01-25
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Expires: 1982-06-28
Abstract
No abstract record available.
Inventors
- 👤 Terrell N Lowry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:51
CPC Classifications
H; H01; H01H; H01H67/00; H01H67/22; H01H67/24; H04; H04Q; H04Q3/00; H04Q3/0008; H04Q3/0012
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
A MULTISTAGE TELEPHONE SWITCHING NETWORK HAVING IN EACH OF ITS STAGES A PLURALITY OF ARRAYS OF CROSSPOINT DEVICES, EACH OF SAID ARRAYS HAVING INPUT AND OUTPUT SETS OF COORDINATE CONTROL CONDUCTORS; AND COMPRISING CONDUCTING MEANS FOR EACH OF SAID ARRAYS CONNECTING THE INPUT AND OUTPUT SETS OF COORDINATE CONTROL CONDUCTORS OF SAID ARRAY; A PLURALITY OF INTERSTAGE CONTROL LINKS INTERCONNECTING SAID OUTPUT SET OF COORDINATE CONTROL CONDUCTORS OF EACH OF THE ARRAYS OF ONE STAGE WITH THE INPUT SET OF COORDINATE CONTROL CONDUCTORS OF EACH OF THE ARRAYS OF A SUCCEEDING STAGE; A PLURALITY OF RELAY CONTACTS CONNECTED RESPECTIVELY IN SAID INTERSTAGE CONTROL LINKS; AND A PLURALITY OF RELAY MEANS FOR CONTROLLING RESPECTIVELY SAID PLURALITY OF RELAY CONTACTS SUCH THAT A CONTINUOUS AND UNIQUE SERIES CONTROL PATH IS ESTABLISHED BETWEEN ANY COORDINATE CONTROL CONDUCTOR OF SAID INPUT SET OF AN ARRAY OF THE FIRST STAGE OF SAID PLURALITY OF STAGES AND ANY COORDINATE CONTROL CONDUCTOR OF SAID OUTPUT SET OF AN ARRAY OF THE LAST STAGE OF SAID PLURALITY OF STAGES.
Claim 2
Dependent Claim
171 words
A MULTISTAGE TELEPHONE SWITCHING NETWORK HAVING IN EACH OF ITS STAGES A PLURALITY OF ARRAYS OF CROSSPOINT DEVICES, EACH OF SAID ARRAYS HAVING INPUT AND OUTPUT SETS OF COORDINATE CONTROL CONDUCTORS; AND COMPRISING CONDUCTING MEANS FOR EACH OF SAID ARRAYS CONNECTING THE INPUT AND OUTPUT SETS OF COORDINATE CONTROL CONDUCTORS OF SAID ARRAY; A PLURALITY OF INTERSTAGE CONTROL LINKS INTERCONNECTING SAID OUTPUT SET OF COORDINATE CONTROL CONDUCTORS OF EACH OF THE ARRAYS OF ONE STAGE WITH THE INPUT SET OF COORDINATE CONTROL CONDUCTORS OF EACH OF THE ARRAYS OF A SUCCEEDING STAGE; A PLURALITY OF RELAY CONTACTS CONNECTED RESPECTIVELY IN SAID INTERSTAGE CONTROL LINKS; AND A PLURALITY OF RELAY MEANS FOR CONTROLLING RESPECTIVELY SAID PLURALITY OF RELAY CONTACTS SUCH THAT A CONTINUOUS AND UNIQUE SERIES CONTROL PATH IS ESTABLISHED BETWEEN ANY COORDINATE CONTROL CONDUCTOR OF SAID INPUT SET OF AN ARRAY OF THE FIRST STAGE OF SAID PLURALITY OF STAGES AND ANY COORDINATE CONTROL CONDUCTOR OF SAID OUTPUT SET OF AN ARRAY OF THE LAST STAGE OF SAID PLURALITY OF STAGES.
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) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |