Data retrieval system
CA 1291574 C · Owner: Burkowski, Forbes J. · Inventors: Krebs, Marke S.; Burkowski, Forbes J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of operating a computer system to store and retrieve information in a database uses a signature file of the database that is divided into subsets. A word signature is mapped to a particular subset during creation of the file and the same mapping information is used to retrieve the information in response to a query keyword. Each word signature is a logical word signature and has two components a physical word signature and a subset designation field. In this way, when information is retrieved from the database, only that subset containing the relevant word signature is scanned. A scanner has an input section, an output section a, control, a memory with address lines and a FIFO …
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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
- Granted October 29, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 29, 2008.
- 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.