Telephone intercommunication system incorporating improved dialing arrangement
US4010331A · kind A · utility
3Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 28, 1975 |
| Grant date | Mar 1, 1977 |
| Priority date | — |
| Expiry date | Mar 28, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/005
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telephone intercommunication system where a plurality of stations have access to a plurality of lines. Each station has a pushbutton type keyset which is connectible to integrated circuits associated with each line and are utilized and generate signals for controlling central office switching equipment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.