Lead-and cadmium-free glass composition for glazing, enamelling and decorating glasses or glass-ceramics, and process for the production of a glass-ceramic coated therewith
CA 2279785 A1 · Owner: Krause, Cora · Inventors: Bug, Michael; Mitra, Ina; Siebers, Friedrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to lead-free and cadmium-free glass for glazing, enamelling and decorating glasses or glass-ceramics which have a low coefficient of thermal expansion of less than 2 x 10-6/K, having the composition (in % by weight) 0-6 Li2O, 0-5 Na2O, 0 to less than 2 K2O where the sum Li2O +, K2 + Na2O is between 2 and 12 0-4 MgO, 0-4 CaO, 0-4 SrO, 0-1, BaO, 0-4 ZnO 3 to less than 10 Al2O3, 13-23 B2O3, 50-65 SiO2 0-4 TiO2, 0-4 ZrO2 and 0-4 F, as replacement for oxygen and containing up to 30% by weight of a pigment which is resistant at the firing temperature, where the glass is suitable for glazing, enamelling and decoration in both primary and secondary firing, and both the …
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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 July 30, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 30, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 30, 2021.
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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.