Optical information record member
CA 1180445 A · Owner: Sony Corporation · Inventors: Watanabe, Kenjiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical information record member is provided which comprises a substrate, a first layer formed on the substrate made of a material having high absorptance of an incident light of a predetermined wavelength in which a part of the incident light is converted to heat and a, second layer formed on the first layer made of a material in which an optical characteristic for a light having a predetermined wavelength is changed by irradiation of the incident light together with the heat generated in the first layer, wherein an information signal can be recorded on the second layer by the change of the optical characteristic of the second layer.
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 January 2, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 2, 2002.
- 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.