Magnetic recording medium and a method of fabricating the same
CA 2072330 A1 · Owner: Arisaka, Yuichi · Inventors: Yamada, Yukari; Sato, Kenichi; Arisaka, Yuichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A magnetic recording medium comprises a nonmagnetic support; a magnetic metal thin film formed on one major surface of the nonmagnetic support; and a protective film consisting of a corrosion-resistant protective film of a corrosion-resistant metal or a protective film of a multilayer structure consisting of at least one corrosion-resistant protective film of a corrosion-resistant metal and one durable protective film of a hard material. A sputtering process of forming the protective film of a multilayer structure consisting of at least one corrosion-resistant protective film and one durable protective film over the magnetic metal thin film formed on the nonmagnetic support traveling along …
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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 June 25, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 25, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 2014.
- 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.