Telephone line test kit
US5754624A · kind A · utility
8Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 4, 1996 |
| Grant date | May 19, 1998 |
| Priority date | — |
| Expiry date | Sep 4, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/308
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An electrical test kit for testing a telephone line from the terminals at the customer's end of the line includes a circuit for testing line continuity without falsely indicating to the voltage source that a telephone call has been answered, a push-button selection switch and a parallel pair of light-emitting diodes connected in reverse polarity relative to each other for determining polarity of the telephone line, and test pads in parallel with the continuity test circuit for permitting the attachment of a voltmeter so as to determine the magnitude of the internal resistance of the telephone line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.