Optical head
CA 2014534 C · Owner: Ogata, Nobuo · Inventors: Nakata, Yasuo; Ogata, Nobuo; Sekimoto, Yoshihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical head having a beam splitting means disposed in the light path from a collimating lens to a beam-shaping means, whereby the light beam from a semiconductor laser beam source retains its elliptical cross section while it passes through a beam splitting means, and its cross section is not made circular until it arrives at a beam-shaping means, so that the size of the beam splitting means, the converging lens and other optical members can be reduced, which makes the optical head compact and lightweight.
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 April 12, 1990 and granted October 25, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 12, 2012.
- 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.