Cordless telephone system
US4706274A · kind A · utility
91Cited by
20References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 11, 1984 |
| Grant date | Nov 10, 1987 |
| Priority date | — |
| Expiry date | May 11, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/2745
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A cordless telephone system includes a control unit having a speaker, a microphone and control circuitry for selective operation in a "normal" mode for communications between the handset and an outside party, a "local answer" mode for communications between a party at the control unit and an outside party, an "intercom" mode for communications between parties at the control unit and the handset and a "3-way" mode for communications between parties at the control unit and handset and an outside party. A microprocessor so responds to ring detect, control and switch-generated interrupt signals as to obtain the desired communications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.