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. 01, 2014
Filed:
Dec. 21, 2010
Sandeep Vuppu, Wheeling, IL (US);
David Cranfill, Antioch, IL (US);
Michael Olley, Lake Zurich, IL (US);
Mark Valentine, Kenosha, WI (US);
Sandeep Vuppu, Wheeling, IL (US);
David Cranfill, Antioch, IL (US);
Michael Olley, Lake Zurich, IL (US);
Mark Valentine, Kenosha, WI (US);
Motorola Mobility LLC, Chicago, IL (US);
Abstract
A stylus () is configured for actively interacting with a touch-sensitive interface () by injecting or sinking charge in response to a touch-detection signal emitted from the touch-sensitive interface (). One stylus () includes a stylus body () and a compound tip () extending axially from the stylus body (). The compound tip () can include a center electrode () that is configured to detect electric field variations from the touch-sensitive interface () and a shroud electrode () that is concentrically disposed about the center electrode (). An active circuit () coupled between the center electrode () and the shroud electrode () is configured to apply a gain to the detected electric field variations and to change a potential of the shroud electrode () synchronously with the electric field variations detected by the center electrode ().