Method of indexing keywords for searching in a database recorded on an information recording medium
CA 2082014 C · Owner: Nortel Networks Limited · Inventors: Berry, Victor A.; Hanssens, Arsene; Ross, Evan B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of storing and searching data on a mass storage medium is provided. A dictionary of keywords in a data file is compiled and a unique ID number is assigned to each keyword. A plurality of the most frequently occurring keywords are assigned ID numbers opposite in sense to the frequency of occurrence of the keyword. The dictionary of keywords is classified into a plurality of classes the class of, keywords least frequently occurring within the database having the fewest levels of indexing and the most amount of information regarding the exact location of a keyword within the data file.
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 November 3, 1992 and granted February 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 3, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 3, 2014.
- 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.