Method and apparatus for recognizing and performing handwritten calculations
Patent 5428805 Issued on June 27, 1995. Estimated Expiration Date: 
December 22, 2012. 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.
December 22, 2012. 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 ReferencesKeyless electronic calculating pen Calculator interface Key-in device Method and apparatus for capturing information in drawing or writing Script/binary-encoded-character processing method and system Electronic checking account apparatus and method having a digitizer to receive information as a check is being written Patent #: 5233547 InventorApplicationNo. 994950 filed on 12/22/1992US Classes:708/141, Including specific nonkeyboard-type information entry345/173, Touch panel345/179, Stylus715/541Handwritten textual inputExaminersPrimary: Bowler, Alyssa H.Assistant: Pan, Daniel H. Attorney, Agent or FirmInternational ClassesG06F 003/033G06F 003/14 G06F 009/06 AbstractA pen-based calculator recognizes handwritten input. The calculator comprises a display simulating a sheet of paper, and a stylus simulating a pen. The user writes a calculation on the calculator as if it were a piece of scratch paper. The calculator uses handwriting recognition to identify the various elements of the calculation, performs the calculation, and then displays the result at an appropriate location.Other References
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