Semiconductor laser device
CA 2005957 C · Owner: Mitsubishi Denki Kabushiki Kaisha · Inventors: Tada, Katsuhisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A semiconductor laser device comprises a semiconductor laser light emitting element, and a cap that cover. and hermetically seals the laser light emitting element. Laser light emitted from the element goes out through a hole formed in the top wall Or the cap. Reflected light blocking means is disposed in the hole in the top wall of the cap. The reflected light blocking means comprises a twisted-nematic liquid crystal cell and a pair of polarizers between which the twisted-nematic liquid crystal cell is disposed.
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 December 19, 1989 and granted May 4, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 19, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 2011.
- 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.