Information recording method and information recording apparatus
CA 2118637 C · Owner: Kawade, Hisaaki · Inventors: Kawade, Hisaaki; Kishi, Etsuro; Yano, Koji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A physical action such as voltage or the like is locally applied to a recording medium in accordance with information to be recorded and a physical quantity such as a current voltage and the like of a portion applied with the physical action of the recording medium is measured. Recording of information is confirmed on the basis of the measured physical quantity.
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 March 9, 1994 and granted May 25, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 9, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 9, 2016.
- 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.