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:
Jul. 07, 1998
Filed:
Feb. 20, 1996
Applicant:
Inventor:
Gerardus J Koolen, Eindhoven, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
345174 ; 345179 ;
Abstract
A data entry device with a resistive layer enables a user to enter data both by finger and stylus. The stylus is electrically connected to the device. An AC driver drives the layer with a time-varying voltage for capacitive finger detection. A DC driver drives the layer with a substantially constant voltage for resistive stylus detection. The AC driver is disabled when the capacitance of the stylus relative to ground is increased due to the user's hand holding the stylus.