Magnetic recording medium
CA 1112359 A · Owner: Iwasaki, Shun-Ichi · Inventors: Iwasaki, Shun-Ichi; Nakamura, Yoshihisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A magnetic recording medium suitable for use in a recording system employing a magnetic recording transducer or head of the single-pole type which operates in a perpendicular magnetization mode comprises a non-magnetic base supporting a layer of low coercive force material formed on the base and which underlies a magnetic recording layer. The magnetic recording layer which faces the magnetic recording transducer or head is formed of an alloy composed mainly of chromium and cobalt and has an easy axis of magnetization perpendicular to the surface of the magnetic recording layer, with the thickness of the latter being no greater than 3.0 microns. The low coercive force material layer has a …
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
- Granted November 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 10, 1998.
- 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.