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Patent US3247325A successfully refreshed from Google Patents.
US3247325A
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Circuit arrangement for testing lines in communication systems
Assignee: Siemens and Halske AG
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Filing: 1962-08-21
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Granted: 1966-04-19
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Expires: 1982-08-21
Abstract
No abstract record available.
Inventors
- 👤 Han Swan Bing
- 👤 Licht Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:06
CPC Classifications
H; H04; H04Q; H04Q3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A CIRCUIT ARRANGEMENT FOR USE IN COMMUNICATION SYSTEMS AND ESPECIALLY TELEPHONE SYSTEMS FOR THE TESTING OF THE BUSY OPERATING CONDITION AND FOR THE BLOCKING OF TEST LINES IN WHICH COMPLEX RESISTANCES ARE CONNECTED, COMPRISING A TEST CIRCUIT, SAID TEST CIRCUIT PROVIDED WITH A VOLTAGE MEASURING DEVICE AND MEANS HAVING A COMPLEX RESISTANCE, SAID COMPLEX RESISTANCE MEANS BEING CONNECTABLE TO A LINE UNDER TEST TO FORM WITH THE COMPLEX RESISTANCE OF SUCH LINE A VOLTAGE DIVIDER, OPERATIVELY CONNECTING SAID VOLTAGE MEASURING CIRCUIT MEANS TO THE INTERMEDIATE POINT OF THE VOLTAGE DIVIDER SO FORMED FOR EFFECTING THE MEASUREMENT OF THE VOLTAGE POTENTIAL THREAT, WITH SAID COMPLEX RESISTANCE MEANS CAUSING A VOLTAGE POTENTIAL REPRESENTING THE TEST POTENTIAL TO REMAIN CONSTANT DURING THE CURRENT RISE IN THE TEST LINE AS A RESULT OF THE COMPLEX RESISTANCE THEREIN.
Claim 2
Dependent Claim
133 words
A CIRCUIT ARRANGEMENT FOR USE IN COMMUNICATION SYSTEMS AND ESPECIALLY TELEPHONE SYSTEMS FOR THE TESTING OF THE BUSY OPERATING CONDITION AND FOR THE BLOCKING OF TEST LINES IN WHICH COMPLEX RESISTANCES ARE CONNECTED, COMPRISING A TEST CIRCUIT, SAID TEST CIRCUIT PROVIDED WITH A VOLTAGE MEASURING DEVICE AND MEANS HAVING A COMPLEX RESISTANCE, SAID COMPLEX RESISTANCE MEANS BEING CONNECTABLE TO A LINE UNDER TEST TO FORM WITH THE COMPLEX RESISTANCE OF SUCH LINE A VOLTAGE DIVIDER, OPERATIVELY CONNECTING SAID VOLTAGE MEASURING CIRCUIT MEANS TO THE INTERMEDIATE POINT OF THE VOLTAGE DIVIDER SO FORMED FOR EFFECTING THE MEASUREMENT OF THE VOLTAGE POTENTIAL THREAT, WITH SAID COMPLEX RESISTANCE MEANS CAUSING A VOLTAGE POTENTIAL REPRESENTING THE TEST POTENTIAL TO REMAIN CONSTANT DURING THE CURRENT RISE IN THE TEST LINE AS A RESULT OF THE COMPLEX RESISTANCE THEREIN.
References Cited (Backward Citations)
US2709203A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |