Method of masking data on a storage medium
CA 2175556 A1 · Owner: Thompson, David · Inventors: Thompson, David; Jamail, Randall; Jamail, Randall
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of masking data on a storage medium for selective playback upon demand or for transportation to another medium. The method comprising the stops of (a) determining the position of the start location on the storage medium, (b) determining the position of the stop location on the storage medium, (c) positioning at least one data track on the storage medium between the start location and the stop location such that the data track has, adjacent thereto enough, space or time for accepting a concealed data track and (d), impressing data on the storage medium for generating the concealed track having a hidden recording area such that the hidden recording area contains concealed data which …
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 December 19, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 19, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 2016.
- 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.