Information recording and reproducing apparatus using probe
CA 2116497 C · Owner: Canon Kabushiki Kaisha · Inventors: Kishi, Etsuro; Kawade, Hisaaki; Takimoto, Kiyoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An information recording and reproducing apparatus for recording and reproducing information to/from a recording medium in a scanning probe microscope comprises a circuit to reproduce recording bits formed on the recording medium on the basis of a physical amount such as tunnel current, interatomic force electrostatic force, or magnetic force which occurs between the probe and the recording medium a sensor to, detect a state such as film thickness or film quality of the recording medium on the basis of the physical amount before the recording bits are reproduced and a, correcting circuit to correct reproducing conditions such as a magnitude of a voltage which is applied between the probe …
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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
- Filed February 25, 1994 and granted September 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 25, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 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.