Telephone for storing particulars of outgoing calls and/or special service codes
US5742669A · kind A · utility
Inventor
Key dates
| Filing date | Dec 8, 1993 |
| Grant date | Apr 21, 1998 |
| Priority date | — |
| Expiry date | Dec 8, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M15/34
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A feature telephone phone set has a call length recording and call sorting system which can record a plurality of called numbers, date, time, length and so on of each telephone call, and store records into two separate memory areas according to whether the call is a local call or a toll call. Recorded contents can be retrieved and shown on an LCD display. When the memory is full, older records are deleted automatically or manually. Because toll calls are more important than local calls, when the memory is full different criteria of deletion are obeyed when automatic deletion is performed. Special service codes and their descriptions are also provided, and each code can be retrieved by a common key and dialled by another common key.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.