High performance file system
CA 2024174 C · Owner: Microsoft Corporation · Inventors: Letwin, James Gordon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is an improved disk structure for organizing data on a disk. A first disk field comprises a boot block. A second field, following the first field comprises a superblock. A third field, following the second field, comprises a spareblock. A number of bands include the series of contiguous sectors for storing data in which each band includes a freespace bitmap indicating sector usage. The freespace bitmap may be located at the head or the tail of the bands. Bitmaps for alternate bands are disposed adjacent to one another. The boot block includes a volume name, a volume identifier and a disk bootstrap program. The superblock includes pointers to free space bitmaps, a bad block …
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
- Filed August 28, 1990 and granted May 21, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 28, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 2012.
- 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.