Information recording medium
CA 2001152 A1 · Owner: Kurisu, Masayoshi · Inventors: Kurisu, Masayoshi; Hashimoto, Hidehiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an information recording medium having laminated two disc substrates by an adhesive, each disc substrate comprising a substrate and a recording layer, so that the recording layers are disposed opposite to each other, this invention provides an information recording medium wherein the adhesive is a hot melt adhesive having a softening point of 130 °C or more. The information recording medium forms no deviation between two laminated disc substrates thereof and has decreased deformation such as warpage even when exposed to an atmosphere at high temperature and humidity for a long time.
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 October 20, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 20, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 20, 2011.
- 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.