Apparatus for road path searching applicable to car navigation system and operation method thereof
CA 2014639 C · Owner: Kondo, Kazuhiko · Inventors: Kondo, Kazuhiko; Hosokawa, Yoshio; Noro, Satoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A road path searching apparatus applicable to a car navigation system is disclosed. Road map data with different detailedness 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 of high detailedness (step 13). When nodes Nai and Nbj exist on a map of lower detailedness (steps 14, 18), a map of one level lower detailedness is selected as a map to be used in the searching process (step 19). Accordingly as following, searching process is performed based on the map data of lower detailedness, time required for processing is reduced.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed April 17, 1990 and granted May 11, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 17, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.