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:
Aug. 21, 2007
Filed:
May. 22, 2002
Applicant:
Thomas L. Andrade, Los Gatos, CA (US);
Inventor:
Thomas L. Andrade, Los Gatos, CA (US);
Assignee:
Atrua Technologies, Inc., Campbell, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R 27/26 (2006.01); G06K 9/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A surface capacitance sensor system is implemented as an array of sensor electrodes near the surface of the integrated circuit and an array of stimulus electrodes below the sensor electrodes. Rows of stimulus electrodes are driven by sources while the voltages at the respective sensor electrodes are measured. Voltage measurements at each sensor electrode allow the surface capacitance at each sensor electrode location to be determined. The capacitance data is used to determine the positions of target electrodes above the array surface as required in the location fingerprint artifacts.