Optical information recording method and medium
CA 1331807 C · Owner: Arai, Yuji · Inventors: Shin, Yuaki; Hamada, Emiko; Ishiguro, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for optically recording information on an optical information recording medium comprising a light transmitting substrate, a light absorptive layer overlaying the substrate to absorb a laser beam and a light reflective layer overlaying the light absorptive layer, which comprises energizing the light absorptive layer by a laser beam entered through the light transmitting substrate, and locally deforming by the, energy thereby generated by the light absorptive layer a, surface layer of the substrate adjacent to the light absorptive layer, to form optically readable pits in the surface layer of the substrate.
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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 August 30, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 30, 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.