Hand-held electronic writing tool
Patent 5434371 Issued on July 18, 1995. Estimated Expiration Date: 
February 1, 2014. 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.
February 1, 2014. 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 ReferencesMethod for recognizing handwritten characters using shape and context analysis Pen-type computer input device Autonomous computer input device and marking instrument Handwriting recognition by character template Patent #: 5303312 InventorApplicationNo. 189974 filed on 02/01/1994US Classes:178/19.04, Pressure stylus345/179StylusExaminersPrimary: Chin, StephenAssistant: Loomis, Paul Attorney, Agent or FirmInternational ClassG08C 021/00AbstractA hand-held electronic writing implement comprises a writing tip for marking a surface and a pressure sensor located at the writing tip for emitting a pressure signal once the writing tip contacts the writing surface. An accelerometer sensor is also located at the writing tip for sensing the acceleration of the tip over the surface and emitting an acceleration signal based on the acceleration of the tip. The pressure signals and acceleration signals are transmitted to a processing circuit located within the implement. An analog-to-digital converter is used to convert the signals into a digital code which is recorded in a recording chip within the instrument. A power source is used to power the electronics of the implement. The writing implement is used in conjunction with a receiver capable of receiving digital information such as a computer having a translating package which translates the digital information in order to determine the original markings made by the writing tip on the writing surface. The translated markings are displayed on a display and are a reproduction on the original markings. The original markings are translated and displayed only when an initialization character, which is predetermined, is marked on the writing surface by the writing tip.Other References
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