Trackball mechanism
Patent 4952919 Issued on August 28, 1990. Estimated Expiration Date: 
April 6, 2009. 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.
April 6, 2009. 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 3643148 Cursor control assembly Input device featuring both trackball and mouse capability X-Y position input device for display system Optoelectronic system housed in a plastic sphere Patent #: 4785180 InventorAssigneeApplicationNo. 334262 filed on 04/06/1989US Classes:345/167, Trackball74/471XY, Control moves in two planes345/163, MouseD14/417TrackballExaminersPrimary: Brier, JefferyAttorney, Agent or FirmInternational ClassG09G 005/00AbstractA trackball-type input device (10) uses a retainer (114) to secure a ball (80) to a housing (12) so that a large segment (164) of the ball (80) protrudes from the housing (12) for manipulation by the user, thereby affording precise control over rotational movement of the ball (80).Other References
| |
