US3231680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic telephone switching system
Assignee: NEC Corp
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Filing: 1962-07-24
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Granted: 1966-01-25
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Expires: 1982-07-24
Abstract
No abstract record available.
Inventors
- 👤 Yamato Shigeki
- 👤 Miyamoto Yoshikazu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:20
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
SUBSCRIBER LINE MONITORING MEANS FOR SIMULTANEOUSLY DETERMINING THE IDENTITY AND STATUS OF A PLURALITY OF SUBSCRIBER LINES WHICH ARE SCANNED IN A PREDETERMINED SEQUENCE COMPRISING FIRST TYPE MEANS FOR SEQUENTIALLY SCANNING SAID SUBSCRIBER LINES; A PLURALITY OF SECOND TYPE MEANS EACH BEING ASSOCIATED WITH ONE OF SAID SUBSCRIBER LINES FOR DETERMINING THE STATUS OF ITS ASSOCIATED SUBSCRIBER LINE UPON ENERGIZATION BY SAID FIRST TYPE MEANS; MEMORY MEANS FOR STORING CODED INFORMATION RELATED TO EACH OF SAID SUBSCRIBER LINES; SAID MEMORY MEANS HAVING AN OUTPUT CIRCUIT ADAPTED TO GENERATE IDENTIFICATION SIGNALS REPRESENTING THE CODED INFORMATION RELATIVE TO THE SUBSCRIBER LINE BEING MONITORED UNDER CONTROL OF SAID FIRST TYPE MEANS.
Claim 2
Dependent Claim
108 words
SUBSCRIBER LINE MONITORING MEANS FOR SIMULTANEOUSLY DETERMINING THE IDENTITY AND STATUS OF A PLURALITY OF SUBSCRIBER LINES WHICH ARE SCANNED IN A PREDETERMINED SEQUENCE COMPRISING FIRST TYPE MEANS FOR SEQUENTIALLY SCANNING SAID SUBSCRIBER LINES; A PLURALITY OF SECOND TYPE MEANS EACH BEING ASSOCIATED WITH ONE OF SAID SUBSCRIBER LINES FOR DETERMINING THE STATUS OF ITS ASSOCIATED SUBSCRIBER LINE UPON ENERGIZATION BY SAID FIRST TYPE MEANS; MEMORY MEANS FOR STORING CODED INFORMATION RELATED TO EACH OF SAID SUBSCRIBER LINES; SAID MEMORY MEANS HAVING AN OUTPUT CIRCUIT ADAPTED TO GENERATE IDENTIFICATION SIGNALS REPRESENTING THE CODED INFORMATION RELATIVE TO THE SUBSCRIBER LINE BEING MONITORED UNDER CONTROL OF SAID FIRST TYPE MEANS.
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 |