Interface apparatus for communication terminal equipment units
US4953199A · kind A · utility
11Cited by
6References
3Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | May 23, 1988 |
| Grant date | Aug 28, 1990 |
| Priority date | — |
| Expiry date | May 23, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S379/902
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An interface apparatus connects one of a plurality of communication terminal equipment units to a single telephone line on the basis of a selection signal supplied via the telephone line. The telephone line is disconnected when there is no answer from the selected communication terminal equipment unit within a predetermined time period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.