Keyboards including color coding and one handed operation
US4555193A · kind A · utility
34Cited by
16References
23Claims
0Family size
Inventor
Key dates
| Filing date | Oct 31, 1983 |
| Grant date | Nov 26, 1985 |
| Priority date | — |
| Expiry date | Oct 31, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0235
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A keyboard is disclosed having keys subdivided into one or more fields. Two keys from the same field concurrently actuated identify a particular character. Characters are also identified by the actuation of a single key independently of any other key. Pivot keys may be included which are a part of more than one field. A color coding arrangement makes the two key combination unambiguously suggested by the keyboard itself. These features make possible a reduction of the number of keys such that a full set of alphanumeric characters may be arranged on the keyboard for one handed operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.