Opto-mechanical cursor positioning device
Patent 4543571 Issued on September 24, 1985. Estimated Expiration Date: 
November 5, 2002. 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.
November 5, 2002. 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 3541541 3805907 3835464 3892963 Acceleration change sensor Cursor position device Apparatus for sensing non-coded images Graphics pen for soft displays Electronic mouse Optical cursor control device Patent #: 4409479 InventorsAssigneeApplicationNo. 06/439552 filed on 11/05/1982US Classes:345/166, Optical detector250/221, Controlled by article, person, or animal715/856CursorExaminersPrimary: Brigance, Gerald L.Attorney, Agent or FirmInternational ClassG06F 3/033 (20060101)AbstractA hand-held "Mouse" contains an optical system for detecting the number of patterns crossed by its movement across a periodic optical pattern. The optical system is limited to detecting the distance traveled by the mouse across the pattern, a mechanical displacement device within the mouse being utilized to detect the direction of movement. Signals from the optical distance detector and the mechanical direction detector are combined to drive the cursor in a controlled direction across a cathode ray tube or other display device.Other References
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