Method of photothermal information recording, reading and erasing
CA 1292066 C · Owner: Grinko, Dmitry A. · Inventors: Grinko, Dmitry A.; Antonov, Alexandr A.; Petrov, Vyacheslav V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for photothermal information recording reading and erasing consists in that the surface of a recording medium is charged prior to the photothermal recording process and then exposed, during photothermal information recording and erasing, to a modulated electromagnetic beam localized to a spot size of the order of one information unit with the energy exceeding the energy required for softening the material of the recording medium and, during information readout, with the energy less than that for softening the material of the recording medium the surface of the recording medium being discharged before erasing information.
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 November 12, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 12, 2008.
- 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.