Modem for switching between voice and data communications on a single telephone call
US4596021A · kind A · utility
133Cited by
2References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1984 |
| Grant date | Jun 17, 1986 |
| Priority date | — |
| Expiry date | Apr 12, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S379/902
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a modem that allows the user to switch back and forth between voice and data telecommunications during the same phone call without redialing. Such switching back and forth between voice and data telecommunications is accomplished by lifting the telephone handset for voice communications and replacing the telephone handset for resumption of data communications. The present invention also allows a local user to communicate with a remote user via a speaker at the remote modem location without the remote user picking up the remote handset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.