Optical information recording and reproducing apparatus
CA 1303738 C · Owner: Endo, Kiyonobu · Inventors: Endo, Kiyonobu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical information recording and reproducing apparatus comprises: a laser light source having a Gaussian intensity distribution of an emitted laser beam; an optical system for focusing the laser beam emitted from said laser light source, having a number of aperture NA represented by, where .lambda. is a wavelength of the laser beam emitted by said laser light source, and .omega.0 is a diameter of a laser beam spot focused by said optical system.
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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 June 16, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 16, 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.