Invertible trackball
Patent 5008528 Issued on April 16, 1991. Estimated Expiration Date: 
July 14, 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.
July 14, 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 ReferencesOptical encoder with a shutter clutched for directional movement Input device featuring both trackball and mouse capability Ball and transducer mounting arrangement for mouse Device for controlling the motion of a video-screen cursor X-Y direction input device Carriage for a computer mouse Patent #: 4831736 InventorApplicationNo. 380092 filed on 07/14/1989US Classes:250/221, Controlled by article, person, or animal345/167TrackballExaminersPrimary: Nelms, David C.Assistant: Le, Que T. Attorney, Agent or FirmInternational ClassG01V 009/04AbstractThe present invention relates to cursor control devices for computers, and particularly relates to cursor control devices for personal computers which involve the use of a ball rotatable by the fingers for controlling cursor movement. | |
