Electronic whiteboard apparatus
Patent 5903252 Issued on May 11, 1999. Estimated Expiration Date: 
October 1, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 1, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References Re35329 Wide screen display device using an endless belt Electronic blackboard and accessories such as writing tools Electronic blackboard system marker and eraser therefor Electronic blackboard interface Patent #: 5274362 InventorAssigneeApplicationNo. 942303 filed on 10/01/1997US Classes:345/105, Electrochromic elements178/18.03, Writing digitizer pad178/18.07, Inductive345/178With alignment or calibration capability (i.e., parallax problem)ExaminersPrimary: Shankar, VijayAttorney, Agent or FirmInternational ClassG08C 21//00Foreign Application Priority Data1996-10-08 JPAbstractIn a multi-plane electronic whiteboard apparatus, a drawing sheet is extended on a main roller and driven rollers so as to be folded back once by means of the intermediate driven roller. The main roller has a diameter larger than (at least not less than twice) the diameter of the driven rollers to ensure a space for forming the folded portion. A portion of the drawing sheet is exposed through an opening of a frame for serving as a drawing plane. The folded portion contributes to providing a total of four drawing planes. Therefore, it is possible to provide the multi-plane electronic whiteboard apparatus with a simple structure and at a low cost.Field of SearchElectrochromic elementsDISPLAY PERIPHERAL INTERFACE INPUT DEVICE Cursor mark position control device Touch panel Including optical detection With alignment or calibration capability (i.e., parallax problem) Position coordinate determination for writing (e.g., writing digitizer pad, stylus, or circuitry) Writing digitizer pad Inductive | |
