Radiation sensitive refractive index changing composition and use thereof
CA 2408217 A1 · Owner: Kumano, Atsushi · Inventors: Bessho, Nobuo; Nishimura, Isao; Kumano, Atsushi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition which can be changed in refractive index by a simple method to give a refractive-index pattern and an optical material in each of which the resultant difference in refractive index is significantly large and is stable regardless of conditions of use thereafter; and a method of forming the pattern or optical material. The composition comprises (A) a decomposable compound, (B) a hydrolyzate of an alkoxide such as tetrabutoxytitanium tetramethoxyzirconium, tetramethoxygermanium or tetramethoxysilane or of a , halide such as tetrachlorosilane and (C) a radiation-sensitive decomposer. The composition is sensitive to a radiation.
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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 March 8, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 8, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 8, 2024.
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Timeline
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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.