Videotex with telephone call screening system
US4922523A · kind A · utility
71Cited by
13References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 7, 1989 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | Aug 7, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/085
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
If a call waiting signal is supplied to a telephone line during reception of a videotex information through a videotex center, a control unit responds to the calling signal to actuate call waiting equipment and an associated switching unit for transmitting the calling signal to a videotex line and displaying an alarm signal at the videotex receiver. When the user of the videotex changes over the switches of the switch box and places his telephone receiver off-hook, he can communicate with the incoming calling party.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.