Apparatus and method for reading helically recorded tracks
CA 2080592 A1 · Owner: Exabyte Corporation · Inventors: Pisciotta, Christopher; Georgis, Steven Philip
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A helical system (10) reads tracks (18) on a storage medium (12) including distorted tracks. Each track (18) comprises a plurality of blocks, with each block having unique block-identifying information. A servo system (84) causes a head (16C) to traverse predetermined original azimuthal paths (P0) across the medium (12) for reading the blocks recorded along each of the original path (P0). A controller (50) uses the block-identifying information to determine whether any blocks expected to be read during traversal of the original path (P0) were not read. If expected blocks were not read, the controller (50) repositions the medium (12) and directs that the medium (12) be re-read with the head …
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 April 18, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 18, 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.