Radiation sensitive refractive index changing composition and refractive index changing method
CA 2387716 A1 · Owner: Yamada, Kenji · Inventors: Yamada, Kenji; Shimokawa, Tsutomu; Nishimura, Isao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition having a refractive index sensitively changeable by a radiation which comprises (A) a decomposable compound (B) a non-decomposable compound , having a refractive index lower than that of the decomposable compound (A) (C) a radiation-sensitive decomposing agent and (D) a stabilizer. The , irradiation of the composition with a radiation ray via a mask decomposes the above (C) and (A) components in a irradiated portion resulting in the , occurrence of the difference in refractive index between an irradiated portion and a non-irradiated portion, which leads to the formation of a pattern having regions of different refractive indexes.
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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 August 24, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 24, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 24, 2023.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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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.