Recording and reproducing apparatus
CA 2079666 C · Owner: Sony Corporation · Inventors: Ishida, Takehisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a recording and reproducing apparatus in which a tracking error between a recording head and a reproducing head secured on a rotary actuator is canceled to thereby effect an accurate tracking. A recording and reproducing apparatus in which a recording head and a reproducing head are secured on a rotary actuator with a constant distance therebetween comprises a rotation angle detector (3) for detecting a rotation angle of the rotary actuator (1) and a servo correction amount generator (4) for generating a servo offset amount corresponding to the change of the rotation angle of the rotary actuator (4) wherein a servo offset based on the servo offset amount …
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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 October 1, 1992 and granted March 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 1, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 1, 2014.
- 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.