Magnetic recording medium and production method thereof
CA 2575750 C · Owner: Yamazaki, Yoshikazu · Inventors: Yano, Daisuke; Yamazaki, Yoshikazu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The magnetic recording medium of the present invention has a pattern formed using , a pattern-forming agent in a laminate of multiple layers including a base material and a , magnetic recoding layer wherein the pattern is recognized on the surface of the laminate , opposite to the base material and the pattern-forming agent is distributed through the , thickness of the laminate wherein a region between the center of the magnetic recording , layer and a magnetic recording-reading side of the laminate has an area having a density , gradient of the pattern-forming agent which gradually declines in the direction from the , center of the magnetic recording layer to the magnetic …
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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 30, 2005 and granted January 15, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 30, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.