Multi-link telephone intercom system
US4188511A · kind A · utility
15Cited by
20References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1978 |
| Grant date | Feb 12, 1980 |
| Priority date | — |
| Expiry date | Jan 27, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/005
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The system includes up to four communication links, a separate link selector for each link, and a separate link scanner for each telephone station. The system is suitable for usage with conventional dial pulse or tone selective key telephone sets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.