Optical device
CA 2474966 A1 · Owner: Japan Science And Technology Agency · Inventors: Taira, Takunori; Shoji, Ichiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical element capable of significantly reducing a heat double refraction effect, wherein depolarization caused by heat-induced double refraction is greatly reduced by using a (110)-cut crystal without any compensation. Depolarization can be reduced by a factor of more than ten compared with the (111)-cut crystal.
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 August 8, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 8, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 8, 2024.
- 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.