Ultraviolet ray absorbent colored glass
CA 2135358 C · Owner: Asahi Glass Company Ltd. · Inventors: Kijima, Takashi; Itoh, Mizuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Ultraviolet ray absorbent colored glass for buildings arid vehicles, which consists essentially of from 65 to 75 wt% of SiO2, from 0.1 to 5.0 wt% of Al2O3 from 10 to 18, wt% of Na2O, from 0 to 5 wt% of K2O from 5 to 15 wt% of, CaO, from 1 to 6 wt% of MgO from 0.05 to 1.0 wt% of SO3, from 0.08 to 0.20 wt% of vanadium as calculated as V2O5 from 0.36 to 0.65 wt% of MnO2, from 0 to 0.0020 wt% of CoO and from 0.06 to 0.18 wt% of iron as calculated as Fe2O3, wherein from 0 to 10 wt% of the total iron content is FeO.
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 November 8, 1994 and granted October 1, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 8, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 8, 2016.
- 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.