Collaborative Input System
US Patent Number: 6,930,673
Issue Date:  August 16 2005

Description:  A collaborative input system including a host computer with a projected display with a plurality of wirelessly connected opaque electromagnetic digitizers used to control the computer, provide annotation capabilities and enable collaboration among the users.


Dual Pen Interactive Whiteboard System

US Patent Number: 8,411,053Issue Date:  April 2, 2013

Description:  An electromagnetic interactive whiteboard system includes a first electronic pen constructed and arranged to operate at a first frequency. At least a second electronic pen is constructed and arranged to operate at a second frequency that is different from the first frequency. An electromagnetic interactive whiteboard has a single conductive grid constructed and arranged to receive electromagnetic signals from the pens due to proximity of the pens to the grid.