Patent US3288929A successfully refreshed from Google Patents.
US3288929A
Expired / Lapsed
US
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Transmission line break detecting circuit
Assignee: Bell Telephone Company of Canada
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Filing: 1965-06-21
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Granted: 1966-11-29
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Expires: 1985-06-21
Abstract
No abstract record available.
Inventors
- 👤 Hutchinson David Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:25
CPC Classifications
H; H04; H04L; H04L43/00; H04L43/08; H04L43/0805; H04L43/0811
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
IN AN ELECTRICAL DATA TRANSMISSION SYSTEM, A TRANSMISSION LINE BREAK DETECTING CIRCUIT COMPRISING: (A) A SIGNAL GENERATOR, RESPONSIVE TO A DATA SOURCE FOR GENERATING ELECTRICAL SIGNALS REPRESENTING THE DATA; (B) A TRANSMISSION LINE; (C) A TRANSMITTER, INCLUDING A SILICON CONTROLLED RECTIFIER RESPONSIVE TO THE SIGNAL GENERATOR FOR TRANSMITTING THE ELECTRIAL SIGNALS TO THE TRANSMISSION LINE; AND (D) A COMPARATOR, CONNECTED TO THE SIGNAL GENERATOR AND TO THE TRANSMISSION LINE, ARRANGED TO COMPARE THE ELECTRICAL SIGNALS FROM THE SIGNAL GENERATOR AND FROM THE TRANSMISSION LINE, AND TO GENERATE A COMPARTOR OUTPUT SIGNAL IF THE ELECTRICAL SIGNALS ARE DEFFERENT WHEN NO CURRENT IS FLOWING IN THE TRANSMISSION LINE.
Claim 2
Dependent Claim
106 words
IN AN ELECTRICAL DATA TRANSMISSION SYSTEM, A TRANSMISSION LINE BREAK DETECTING CIRCUIT COMPRISING: (A) A SIGNAL GENERATOR, RESPONSIVE TO A DATA SOURCE FOR GENERATING ELECTRICAL SIGNALS REPRESENTING THE DATA; (B) A TRANSMISSION LINE; (C) A TRANSMITTER, INCLUDING A SILICON CONTROLLED RECTIFIER RESPONSIVE TO THE SIGNAL GENERATOR FOR TRANSMITTING THE ELECTRIAL SIGNALS TO THE TRANSMISSION LINE; AND (D) A COMPARATOR, CONNECTED TO THE SIGNAL GENERATOR AND TO THE TRANSMISSION LINE, ARRANGED TO COMPARE THE ELECTRICAL SIGNALS FROM THE SIGNAL GENERATOR AND FROM THE TRANSMISSION LINE, AND TO GENERATE A COMPARTOR OUTPUT SIGNAL IF THE ELECTRICAL SIGNALS ARE DEFFERENT WHEN NO CURRENT IS FLOWING IN THE TRANSMISSION LINE.
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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |