Position determining apparatus
Patent 4885433 Issued on December 5, 1989. Estimated Expiration Date: 
January 3, 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.
January 3, 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 ReferencesPosition-sensitive photodetector and light transmissive tablet and light-emitting pen Patent #: 4794634 InventorApplicationNo. 292947 filed on 01/03/1989US Classes:178/20.04Phase detectingExaminersPrimary: Schreyer, Stafford D.Attorney, Agent or FirmInternational ClassG08C 021/00AbstractAn apparatus for precisely locating the position of a transmitter within either a plane or within a three dimensional space. More particularly the apparatus of the invention is adapted for use with a computer and includes a pen-sized movable transmitter, or mouse, whose exact position within a plane or three dimensional space can be determined without the use of any physical connection between the transmitter and the rest of the apparatus. | |
