Absolute static lock of files and directories on magnetic disk storage media in single machine personal microcomputers
CA 2101123 C · Owner: Yeow, Kok-Wah · Inventors: Yeow, Kok-Wah
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method by which absolute static lock may be applied at media level,to files and directories in File Allocation Table (FAT)based storage media,of single machine personal microcomputers running within the Disk Operating System (DOS) or equivalent environment is disclosed. To apply absolute static lock at media level on a target file or directory, the directory entry data field on disk for the target file or directory in the host machine is located and read into a convenient area of the host machine memory. The directory entry data field is restructured according to the procedure and in the non-DOS format of this invention.The original directory entry data field on the target media is …
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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 July 22, 1993 and granted December 30, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 22, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 22, 2015.
- 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.