Method and apparatus for data hashing
CA 1287183 C · Owner: American Telephone And Telegraph Company · Inventors: Churm, Brian Richard; Diesel, Michael Evans
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract A data hashing arrangement particularly suitable for efficient database storage and fast retrieval of large numbers of character strings. A database address is determined for a character string by replacing individual characters with random numbers selected from a predefined table of random numbers. The table locations of the selected random numbers are uniquely defined by the characters.The selected numbers are combined by iteractive bit reordering and exclusive-OR operations to form a result, which is then used to derive the database address where the character string is stored.
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
- Granted July 30, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 30, 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.