The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 30, 1991
Filed:
Apr. 16, 1990
Yutaka Tamura, Gifu, JP;
Yoshio Hosokawa, Gifu, JP;
Satoshi Noro, Gifu, JP;
Kazuhiko Kondo, Gifu, JP;
Sanyo Electric Co., Ltd., , JP;
Abstract
A road path searching apparatus applicable to a car navigation system is disclosed. Road map data with different level of detail for defining a predetermined area is stored previously in a memory device. First, nodes Nai and Nbj adjacent to each of the search nodes Pa and PB are detected based on map data having a high level of detail. When nodes Nai and Nbj exist on a map of a lower level of detail, a map of one lower level of detail is selected as a map to be used in the searching process. Accordingly, as following searching process is performed based on the map data of lower level of detail, required processing time is reduced.