Apparatus for testing a telephone line
US4564728A · kind A · utility
24Cited by
2References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 13, 1984 |
| Grant date | Jan 14, 1986 |
| Priority date | — |
| Expiry date | Apr 13, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/30
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telephone line tester comprises a bipolar LED which has coupled thereto two wires which terminate in a modular plug of the type used on a telephone subset. In this manner the plug is inserted into a telephone jack or receptacle, and if the telephone line is operating properly, one of the diodes will illuminate depending upon the polarity of the telephone lines. The illumination of the diode presents a visual indication to the consumer that the telephone line is operating correctly. In this manner the consumer may save a service call by locating the difficulty in telephone service with the telephone subset on the line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.