Database processing system
CA 2053091 A1 · Owner: Ryu, Tadamitsu · Inventors: Aoe, Shigeru; Kakehi, Gen; Ryu, Tadamitsu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A database processing system includes an entity file which stores individual data units in forms corresponding to link types, a plurality of programs for making access to the data units within the entity file based on commands which specify data units and link types which are to be used when retrieving the data units, a plurality of link parts tables which are provided in correspondence with the programs where each, of the link parts table supplies link parts information specified by the link type to the corresponding one of the programs, a command address table for converting the command which specifies the data unit and is obtained from one of the programs into an address of the entity …
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 October 9, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 9, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 9, 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.