Route searching system of navigation apparatus
Patent 4926336 Issued on May 15, 1990. Estimated Expiration Date: 
December 27, 2008. 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.
December 27, 2008. 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 ReferencesPortable map display apparatus Navigation system for automotive vehicle with automatic navigation start and navigation end point search and automatic route selection Patent #: 4796189 InventorAssigneeApplicationNo. 290207 filed on 12/27/1988US Classes:701/202, Route pre-planning340/990, With map display340/995.19, Route determination and display on map701/211Having audio or visual route guidanceExaminersPrimary: Chin, GaryAttorney, Agent or FirmInternational ClassG06F 015/50Foreign Application Priority Data1987-12-28 JPAbstractA route searching system having node data 3 representing information on positions and attributes of the same, intersection data 1 representing information on intersections, road data 2 representing information on roads, and a route searching section 4 for searching for the optimum route from the intersection data and the road data. Weighted information based on road circumstances is included in the road data, and weighing is performed in accordance with the weighted information with respect to possible routes searched by the route searching section to find the optimum route. This system enables the time taken for traveling along a selected course to be computed with reference to the weighted information and enables route searching to be performed in short period of time. Also, intersections to be passed without turning can readily be removed to prepare guidance data only from data necessary for guidance. | |
