The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 1987
Filed:
Mar. 11, 1985
Wang Laboratories, Inc., Lowell, MA (US);
Abstract
A writing pad in which a grid of electrical elements defines an array of discrete locations on the writing surface with a density of at least 100.times.50=5000 locations per square inch, and digital circuitry is connected to the grid to determine the locations at which writing stimuli are being received. In other aspects, circuitry is used to identify the upper and lower boundaries along one dimension of the writing surface, of a local region at which writing stimuli are being received; the writing surface is scanned to identify the coordinate value along one dimension of a point at which writing stimuli are being received, by scanning respectively different predetermined portions of the writing surface along that one dimension, all of the portions being scanned simultaneously; a local zone is defined in the vicinity of an identified point of touching, and limits the scanning to that local zone; and a portion of the writing surface includes key zones and a particular digital symbol is generated in response to writing stimuli being received at any of the locations corresponding to one of the key zones.