US3275754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Call distributing circuit
Assignee: AT&T Inc
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Filing: 1963-06-12
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Granted: 1966-09-27
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Expires: 1983-06-12
Abstract
No abstract record available.
Inventors
- 👤 Jesse O Howell
- 👤 Donald A Macleod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:15
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
IN A TELEPHONE SYSTEM, A PLURALTIY OF LINES ARRANGED IN A GROUP, CROSS-POINT SWITCHING MEANS FOR EFFECTING CONNECTIONS TO SAID LINES, MARKER MEANS FOR CONTROLLING SAID SWITCHING MEANS, ARTIFICIAL BUSY CIRCUIT MEANS FOR EACH OF SAID LINES, SAID LAST-MENTIONED MEANS INCLUDING A RELAY HAVING A PRIMARY AND A SECONDARY WINDING, A CAPACITOR, MEANS FOR NORMALLY CHARGING SAID CAPACITOR EXCLUDING SAID RELAY WINDINGS, MEANS RESPONSIVE TO ESTABLISHMENT OF A CONNECTION THROUGH SAID SWITCHING MEANS BY SAID MARKER MEANS TO A LINE FOR DISCHARGING SAID CAPACITOR THROUGH SAID PRIMARY WINDING, LOCKING MEANS RESPONSIVE TO ENERGIZATION OF SAID RELAY FOR LOCKING SAID RELAY OPERATED, MEANS FOR DISCHARGING SAID CAPACITOR ON ORGANIZATION OF A CALL BY THE LINE AT A RATE SUCH AS TO PREVENT OPERATION OF SAID RELAY AND TO VALUE INSUFFICIENT TO ENERGIZE SAID RELAY ON DIRECT APPLICATION OF GROUND TO SAID CAPACITOR, AND MEANS FOR RELEASING ALL OF SAID LOCKING MEANS ON ENERGIZATION OF ALL SAID RELAYS OF SAID LINES IN SAID GROUPS.
Claim 2
Dependent Claim
162 words
IN A TELEPHONE SYSTEM, A PLURALTIY OF LINES ARRANGED IN A GROUP, CROSS-POINT SWITCHING MEANS FOR EFFECTING CONNECTIONS TO SAID LINES, MARKER MEANS FOR CONTROLLING SAID SWITCHING MEANS, ARTIFICIAL BUSY CIRCUIT MEANS FOR EACH OF SAID LINES, SAID LAST-MENTIONED MEANS INCLUDING A RELAY HAVING A PRIMARY AND A SECONDARY WINDING, A CAPACITOR, MEANS FOR NORMALLY CHARGING SAID CAPACITOR EXCLUDING SAID RELAY WINDINGS, MEANS RESPONSIVE TO ESTABLISHMENT OF A CONNECTION THROUGH SAID SWITCHING MEANS BY SAID MARKER MEANS TO A LINE FOR DISCHARGING SAID CAPACITOR THROUGH SAID PRIMARY WINDING, LOCKING MEANS RESPONSIVE TO ENERGIZATION OF SAID RELAY FOR LOCKING SAID RELAY OPERATED, MEANS FOR DISCHARGING SAID CAPACITOR ON ORGANIZATION OF A CALL BY THE LINE AT A RATE SUCH AS TO PREVENT OPERATION OF SAID RELAY AND TO VALUE INSUFFICIENT TO ENERGIZE SAID RELAY ON DIRECT APPLICATION OF GROUND TO SAID CAPACITOR, AND MEANS FOR RELEASING ALL OF SAID LOCKING MEANS ON ENERGIZATION OF ALL SAID RELAYS OF SAID LINES IN SAID GROUPS.
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) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |