Portable map display apparatus
Patent 4570227 Issued on February 11, 1986. Estimated Expiration Date: 
February 11, 2003. 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.
February 11, 2003. 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 3845289 3925641 Auto routing computer for eliminating the need for maps or travel instructions Motor vehicle map display system Highway information system Patent #: 4481584 InventorsAssigneeApplicationNo. 06/407290 filed on 08/11/1982US Classes:701/202, Route pre-planning340/990, With map display340/995.19Route determination and display on mapExaminersPrimary: Chin, GaryAttorney, Agent or FirmInternational ClassesG06F 17/50 (20060101)G06Q 10/00 (20060101) G09B 29/10 (20060101) G09B 21/00 (20060101) G01C 21/20 (20060101) Foreign Application Priority Data1981-08-17 JPAbstractA portable map display apparatus stores, in a memory, features of a plurality of points on a given map and features of routes connecting such points and, on receiving input signals concerning a given point of start and a given destination, sequentially displays, on an output device, the information on the optimum route to be followed in reaching the destination from the point of start. | |
