Optically recordable carrier
CA 1266975 C · Owner: Miyai, Seiichi · Inventors: Akamatsu, Junichi; Miyai, Seiichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an optically recordable carrier having a substrate and an optical record layer on the substrate the optical record layer is enveloped, at all of its surfaces with a protective film of inorganic material by which the resistance to corrosion of the optical record layer is improved considerably.
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 March 27, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 27, 2007.
- 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.