Information processor and disk memory used in the same
CA 2025724 C · Owner: Sugita, Yutaka · Inventors: Nagai, Masaichi; Minemura, Hiroyuki; Sato, Yoshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The information processor uses a portable memory which is able to be overwritten by laser power modulation system. The memory includes a disk type recording medium incorporated rotatably in a thin case and carries, out write/read/erase by means of a first magnetic field application device, a second magnetic field application device, and an optical head radiating light through this case.
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 September 19, 1990 and granted May 7, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 19, 2012.
- 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.