Programmable cartridge telephone communication system
US4506346A · kind A · utility
17Cited by
13References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1982 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Dec 1, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/007
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A cartridge comprising circuitry and program instructions is added to a processor controlled telephone communication system to selectively change the operating system in accordance with the cartridge used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.