US3243514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic calling line identification circuit
Assignee: AT&T Inc
•
Filing: 1963-02-27
•
Granted: 1966-03-29
•
Expires: 1983-02-27
Abstract
No abstract record available.
Inventors
- 👤 Harold R Moore
- 👤 William T Sears
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:12
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
IN AN AUTOMATIC CALLING LINE IDENTIFICATION CIRCUIT FOR SMALL TELEPHONE SYSTEMS, A LOCAL OFFICE; A PLURALITY OF CALLING LINES CONNECTED TO SAID OFFICE, AT LEAST SOME OF SAID LINES HAVING MORE THAN ONE TELEPHONE SUBSCRIBER THEREON; MEANS FOR PLACING AN IDENTIFYING SIGNAL ON SELECTED ONES OF SAID LINES IN RESPONSE TO A SERVICE REQUEST THEREFROM; AND A PLURALITY OF BREAKDOWN DEVICES HAVING DIFFERENT BREAKDOWN LEVELS CONNECTED TO EACH OF SAID LINES, THOSE HAVING THE LOWER OF SAID LEVELS BEING ENERGIZED RESPONSIVE TO SAID IDENTIFYING SIGNAL TO SELECTIVELY ENERGIZED ONLY THOSE OF SAID DEVICES HAVING THE HIGHER OF SAID LEVELS WHICH CORRESPOND TO THE ONE OF SAID SUBSCRIBERS INITIATING SAID REQUEST.
Claim 2
Dependent Claim
110 words
IN AN AUTOMATIC CALLING LINE IDENTIFICATION CIRCUIT FOR SMALL TELEPHONE SYSTEMS, A LOCAL OFFICE; A PLURALITY OF CALLING LINES CONNECTED TO SAID OFFICE, AT LEAST SOME OF SAID LINES HAVING MORE THAN ONE TELEPHONE SUBSCRIBER THEREON; MEANS FOR PLACING AN IDENTIFYING SIGNAL ON SELECTED ONES OF SAID LINES IN RESPONSE TO A SERVICE REQUEST THEREFROM; AND A PLURALITY OF BREAKDOWN DEVICES HAVING DIFFERENT BREAKDOWN LEVELS CONNECTED TO EACH OF SAID LINES, THOSE HAVING THE LOWER OF SAID LEVELS BEING ENERGIZED RESPONSIVE TO SAID IDENTIFYING SIGNAL TO SELECTIVELY ENERGIZED ONLY THOSE OF SAID DEVICES HAVING THE HIGHER OF SAID LEVELS WHICH CORRESPOND TO THE ONE OF SAID SUBSCRIBERS INITIATING SAID REQUEST.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |