Glass for wavelength division multiplexing optical filter
CA 2429608 A1 · Owner: Central Glass Company, Limited · Inventors: Kuriyama, Nobuya
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to first, second and third glasses for wavelength division multiplexing optical filters. The first glass contains 50-65 wt% of SiO2, 5-25 wt% of Na2O, 4-20 wt% of K2O 0-20 wt% of CaO, 0-10 wt% of MgO, 0-10 wt% of BaO 0-10 wt% of Al2O3, and 0-10 wt% of TiO2. The second glass contains 35-55 wt% of SiO2, 10-30 wt% of TiO2 4-20 wt% of ZrO2, 5-25 wt% of, Na2O, 0-10 wt% of Al2O3 0-20 wt% of CeO2, 0-5 wt% of Li2O, 0-20 wt% of K2O and 0-3wt% of at least one metal oxide selected from MgO CaO, SrO, BaO, and ZnO. The third glass contains 35-55 wt% of SiO2 0-20 wt°/ of , Al2O3, 0-10 wt% of B2O3 1-35 wt% of TiO2, 1-15 wt% of CeO2, 0-10 wt% of Li2O 5-25, wt% of Na2O, and 0-20 wt% of …
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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 May 26, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 26, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 26, 2025.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.