Hub for optical disk and optical disk
CA 2056663 A1 · Owner: Todo, Akira · Inventors: Okubo, Atsushi; Kurisu, Masayoshi; Todo, Akira
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In accordance with the present invention there are provided hubs for optical disk in which a lubricant layer is formed on or in the vicinity of an opening edge into which a spindle of the optical disk driving device is inserted and, optical disks in which the above-mentioned hubs are used. By using the optical disks provided with such hubs as mentioned above, sliding properties between the spindle of the disk drive and the center hole of the hub are markedly improved, and excellent loading performance of the optical disk is accomplished.
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 November 29, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 29, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 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.