Key telephone system intercom arrangement
US3976847A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1975 |
| Grant date | Aug 24, 1976 |
| Priority date | — |
| Expiry date | Nov 12, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/10
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A key telephone system is disclosed in which intercom calls may be answered "hands-free" at the called station. Intercom calls are originated in the standard manner, with the subscriber picking up the handset at the calling station and dialing the number of the called station. A voice communication path is established through the station selector to the telephone set represented by the dialed number. DC bias on this communication path through the station selector activates a loudspeaker and microphone arrangement in the called telephone set. The called party may thus converse "hands-free" with the calling party by utilizing the activated loudspeaker and microphone of the station set, and need not manipulate the station set for the duration of the conversation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.