Telephone-coupled visual alphanumeric communication device for deaf persons
US4191854A · kind A · utility
Inventor
Key dates
| Filing date | Jan 6, 1978 |
| Grant date | Mar 4, 1980 |
| Priority date | — |
| Expiry date | Jan 6, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S379/906
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A portable self-powered electrically conductively isolated device converts alphanumeric electric signals transmitted from a Touch-Tone telephone at a sending station to visual signals at a receiving telephone station. A magnetic pickup is attached to the activated receiving telephone, as by a suction cup, and feeds two-frequency Touch-Tone signals to tuned detectors which energize two overlapped parallel-busbar grids interconnected at their crossover points by panel-displayed light-emitting diodes. By code the touch-sent signals are converted to visually received signals; for example, on pushbutton 5 one touch means "J", two touches "K" and three touches"L".
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.