Sparse array bit map used in data bases
CA 1214284 A · Owner: Wang Laboratories, Inc. · Inventors: Weiss, Andrew M.; Waisman, Amnon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A data base system uses a self-descriptive index key format having variable length data fields so that the data base system manipulation is independent of the type and arrangement of the data being stored and retrieved. The data is characterized by three index variables which represent the data table, the record in that table, and a particular field within that record. Each table is composed of data imbedded in the B-tree index structure of the data base. In order to access records using the field variables the, data base additionally includes an inverted B-tree index logically related to the original index. The operation of the index is enhanced by the use of data compression and the use …
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 November 18, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 18, 2003.
- 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.