Expert system development support system and expert system
CA 2040301 C · Owner: Hitachi, Ltd. · Inventors: Amano, Masahiko; Kudo, Hiroyuki; Harada, Yasushi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An expert system in which a plurality of knowledge descriptive layers are provided in a frame system. Each descriptive layer is composed of plural frames; the frames of the lowermost knowledge descriptive layer are provided in association with the elements of a knowledge processing object system. The content of frames of the upper knowledge descriptive layers is determined as an inference is made with reference to the frames of the lower layer. This determining is started and executed by the updating of the content of slots of the frames.
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 11, 1991 and granted January 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 11, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 11, 2013.
- 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.