External cavity type light source
CA 2290063 C · Owner: Asami, Keisuke · Inventors: Asami, Keisuke
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An external cavity type light source which has a semiconductor laser 1 coated on one end 1a with a reflection prevention film 1A, wherein emitted light from the end face of the semiconductor laser 1 on the reflection prevention film side is converted into collimated light and the collimated light having a wavelength selected through a diffraction grating 2 is fed back into the semiconductor laser 1 and wherein emitted, light from an opposite end 1b of the semiconductor laser 1 is converted into collimated light and the collimated light is gathered and output to an optical fiber 10. An unpolarized light splitter (light branch element) 4 is placed between the diffraction grating 2 and the …
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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 November 19, 1999 and granted May 14, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 19, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 19, 2021.
- 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.