Patent · US Expired

Data input board

US4934470A · kind A · utility

3Cited by

1References

10Claims

0Family size

Assignee

Preh-Werke GmbH & Co. KG · DE

Inventors

Gottfried Berthold · Reutlingen, DE
Peter Ambros · Leutershausen, DE
Walter Muller · Allendorf (Eder), DE

Key dates

Filing date	May 30, 1989
Grant date	Jun 19, 1990
Priority date	—
Expiry date	May 30, 2009

Classification

Technology area (CPC G)Physics
CPC primaryG06F3/045
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

A data input board for the electrical detection of the coordinates of a writing tip includes a rigid plate and an elastic plate with electrically conductive surfaces facing each other at a small distance which contact point by point under the effect of a writing tip. The elastic plate is formed as a stretched, coated sieve tissue in order to avoid the requirement of spacers within the input surface.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.