Optical information recording medium and recording-reproducing apparatus
CA 1294705 C · Owner: Canon Kabushiki Kaisha · Inventors: Sakagami, Wataru; Ogasawara, Yutaka
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This specification discloses an optical information recording medium comprising a plurality of rows of tracking tracks arranged at intervals a, plurality of recording portions provided between the tracking tracks and on which information is recorded by application of a light beam thereto and an optically, detectable mark provided at at least one location on at least one of the recording portions and indicative of a reference position. The specification also discloses an information recording-reproducing apparatus comprising a light source, lens means for imaging the light beam from the light source on an optical information recording medium, photodetector means for receiving the light from …
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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
- Granted January 21, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 21, 2009.
- 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.