File system with read/write and read only storage
CA 2045799 C · Owner: Thompson, Kenneth L. · Inventors: Thompson, Kenneth L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A file system which has component file systems including a primary file system which is read/write and a number of dump file systems which are read only. Each dump file system is created from the primary file system by means of a dumpoperation and conserves the state of the primary file system at the time the dump operation was performed. Component file systems share read only storage elementswith older component file systems. The file system is implemented on a system including a file server, a magnetic disk mass storage device and an optical write, once-read many (WORM) disk. The magnetic disk mass storage device contains the read/write storage elements of the primary file system and …
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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
- Filed June 27, 1991 and granted March 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 27, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 27, 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.