Device and a method for connecting a mobile phone handset to an external keyboard
US6628961B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 4, 2000 |
| Grant date | Sep 30, 2003 |
| Priority date | — |
| Expiry date | Aug 4, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2250/18
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a device and a method for connecting a mobile phone handset to an external keyboard. A multimedia card slot interface is included in the portable keyboard of the present invention, which can be incorporated to the original interface of the handset. In the meantime, a microprocessor and a random access memory are also included in the keyboard. After sending an interrupt command from the handset to the keyboard, by scanning the keyboard, whether the key is pressed or not is determined by the microprocessor and the key value is stored in its own random access memory. When the key value is stored in the random access memory, an interrupt command is sent to the handset by the keyboard. After the handset is ready, the key value will be transferred to the handset via the multimedia card slot interface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.