US3322907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visual signaling apparatus for electronic switching system
Assignee: AT&T Inc
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Filing: 1964-04-01
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Granted: 1967-05-30
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Expires: 1984-04-01
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Browne
- 👤 Goldschmidt Karl
- 👤 Oscar H Williford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:25
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN A TELEPHONE SWITCHING SYSTEM, A PLURALITY OF LINE CIRCUITS, A TIME DIVISION BUS, MEANS FOR GENERATING AND STORING REPETITIVELY A SET OF SIGNAL INDICIA CORRESPONDING TO A SELECTED ONE OF SAID LINE CIRCUITS, MEANS FOR DERIVING A TRAIN OF RELATIVELY LOW DUTY CYCLE GATING PULSES AT A RELATIVELY HIGH PULSE REPETITION RATE FROM SAID SET OF REPETITIVELY STORED SIGNALS, MEANS RESPONSIVE TO SAID GATING PULSES FOR CONNECTING THAT ONE OF SAID LINE CIRCUITS CORRESPONDING TO SAID SET OF SIGNAL INDICIA TO SAID BUS FOR THE DURATION OF EACH OF SAID PULSES, A SIGNAL LAMP, A SOURCE OF ALTERNATING CURRENT HAVING A FREQUENCY SUBSTANTIALLY LOWER THAN SAID RATE, AND MEANS JOINTLY RESPONSIVE TO ONE OF SAID PULSES AND TO A VOLTAGE OF A PARTICULAR POLARITY
Claim 2
Dependent Claim
125 words
IN A TELEPHONE SWITCHING SYSTEM, A PLURALITY OF LINE CIRCUITS, A TIME DIVISION BUS, MEANS FOR GENERATING AND STORING REPETITIVELY A SET OF SIGNAL INDICIA CORRESPONDING TO A SELECTED ONE OF SAID LINE CIRCUITS, MEANS FOR DERIVING A TRAIN OF RELATIVELY LOW DUTY CYCLE GATING PULSES AT A RELATIVELY HIGH PULSE REPETITION RATE FROM SAID SET OF REPETITIVELY STORED SIGNALS, MEANS RESPONSIVE TO SAID GATING PULSES FOR CONNECTING THAT ONE OF SAID LINE CIRCUITS CORRESPONDING TO SAID SET OF SIGNAL INDICIA TO SAID BUS FOR THE DURATION OF EACH OF SAID PULSES, A SIGNAL LAMP, A SOURCE OF ALTERNATING CURRENT HAVING A FREQUENCY SUBSTANTIALLY LOWER THAN SAID RATE, AND MEANS JOINTLY RESPONSIVE TO ONE OF SAID PULSES AND TO A VOLTAGE OF A PARTICULAR POLARITY
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) | 1970-05-29 | 1970-11-28 | 1971-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-29 | 1974-11-28 | 1975-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-29 | 1978-11-28 | 1979-05-30 | $7700.00 | Window Closed / Lapsed |