US3235668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone switching network
Assignee: AT&T Inc
•
Filing: 1962-08-31
•
Granted: 1966-02-15
•
Expires: 1982-08-31
Abstract
No abstract record available.
Inventors
- 👤 Henry H Abbott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:13
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0008; H04Q3/0012
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A SWITCHING NETWORK COMPRISING AN INPUT TERMINAL; AN OUTPUT TERMINAL; MARKING MEANS FOR APPLYING MARKING POTENTIALS TO SAID INPUT TERMINAL AND TO SAID OUTPUT TERMINAL; A PLURALITY OF PATHS BETWEEN SAID INPUT TERMINAL AND SAID OUTPUT TERMINAL DEFINED BY CROSSPOINT DEVICES; IDLE PATH SELECTING MEANS COMPRISING SAID PLURALITY OF PATHS, SCANNING MEANS FOR SEQUENTIALLY DETERMINGING FROM EACH OF SAID PLURALITY OF PATHS THE ELECTRICAL CONTINUITY THEREOF, DETECTION MEANS RESPONSIVE TO A DETERMINATION BY SAID SCANNING MEANS THAT ONE OF SAID PLURALITY OF PATHS IS ELECTRICALLY CONTINUOUS FOR DISABLING SAID SCANNING MEANS, AND PULSING MEANS CONTROLLED BY SAID DETECTION MEANS FOR APPLYING A CROSSPOINT ENABLING EQUAL TO SAID OUTPUT TERMINAL.
Claim 2
Dependent Claim
125 words
IN A SWITCHING NETWORK A CROSSPOINT DEVICE COMPRISING CROSSPOINT ENABLING MEANS AND CONNECTING MEANS; AND CONTROL MEANS FOR CONTROLLING SAID CROSSPOINT DEVICE COMPRISING A CONTROL CONDUCTOR HAVING SAID CROSSPOINT ENABLING MEANS IN SERIES THEREWITH, A FIRST SIGNALLING CONDUCTOR AND A SECOND SIGNALLING CONDUCTOR BOTH OF WHICH ARE ASSOCIATED WITH SAID CROSSPOINT DEVICE, SAID CONNECTING MEANS RESPONSIVE TO SAID ENABLING MEANS FOR CONNECTING SAID FIRST SIGNALLING CONDUCTOR TO SAID SECOND SIGNALING CONDUCTOR, AND SWITCHING MEANS CONNECTED IN SERIES WITH SAID CONTROL CONDUCTOR AND RESPONSIVE TO MARKING POTENTIALS APPLIED THERETO TO PRODUCE CURRENT FLOW THROUGH SAID CONTROL CONDUCTOR AND RESPONSIVE TO A CONTROL POTENTIAL APPLIED THROUGH SAID FIRST SIGNALLING CONDUCTOR AND SAID CONNECTING MEANS TO SAID SECOND SIGNALLING CONDUCTOR TO INHIBIT CURRENT FLOW THROUGH SAID CONTROL CONDUCTOR.
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) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |