Magnetic recording medium and method for ascertaining authenticity of thesame
CA 1305793 C · Owner: Obayashi, Taro · Inventors: Obayashi, Taro; Sugaya, Kenji; Nakai, Takayuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A magnetic recording medium in a magnetic recording, medium whose base material is provided with a magnetic data portion, is disclosed which comprises, at least a first, verification portion having a desired light transmission coefficient and a second verification portion formed of magnetic material arranged separately from the magnetic data portion. A method for ascertaining authenticity of the magnetic recording medium is also disclosed which comprises the steps of detecting the light transmission coefficient at the first verification portion thereby to verify the base material of *he recording medium and detecting the magnetic material at the second verification portion thereby to detect …
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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
- Granted July 28, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 28, 2009.
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Timeline
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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.