Portable wireless communication device
US5440559A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 10, 1993 |
| Grant date | Aug 8, 1995 |
| Priority date | — |
| Expiry date | Nov 10, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/1143
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A portable communication device which also has an infrared transceiver. A portable communication device can automatically establish infrared communication sessions with another portable communication device or desktop computer having an infrared transceiver. The portable communication device and the other device may exchange textual and graphical information, as well as the current time, and then reconcile the newly received information with that information in possession before the communication session began. Multiple portable communication devices and computers may communicate, while conserving battery power, using a time division multiplexing scheme where the infrared transceivers are active during a short, periodic time slots. Multiple communication session may overlap in time as long as they are not active during the same time slot.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.