Magnetic recording medium and method for preparing the same
CA 2036496 A1 · Owner: Saiki, Koji · Inventors: Saiki, Koji; Nasu, Shogo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A magnetic recording medium is disclosed wherein, a magnetic film comprising a partially oxidized cobalt with its in-plane coercive force not less than 500 Oe is provided on a substrate. Further disclosed are megnetic recording media, wherein there is further provided an underlayer comprising Cr, Fe or an Fe-Co alloy under said magnetic film and wherein a perpendicular magnetic anisotropic film comprising a partially oxidized metal is further provided on said magnetic film. The magnetic recording media of the present invention are high in recording density and reproduction output, low in noise and high in S/N ratio.
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 February 18, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 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.