Translucent or opaque glass-ceramic containing .beta.-quartz solid solution as the predominant crystal phase, and the use thereof in a cooking hob
CA 2299202 A1 · Owner: Mitra, Ina · Inventors: Rudinger, Bernd; Schonberger, Klaus; Mitra, Ina
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A translucent or opaque glass-ceramic containing .beta.-quartz solid solution as the, predominant crystal phase, having a composition (in % by weight) of Li2O 3-5 Na2O 0-1, K20 0-1, Na2O + K2O 0.2-2, MgO 0-1.8 BaO 0-3.5, SrO 0-1, CaO 0-1, BaO + SrO + CaO, 0.2-4, ZnO 0-2.8, Al2O3 17-26, SiO2 62-72 TiO2 0-2.5, ZrO2 0-3, TiO2 + ZrO2 1-, <3.5 Sb2O3, 0-2, As2O3 0-2, SnO 0-<1, and P2O5 0-8 an average coefficient of linear , thermal expansion .alpha.20-700°C of <0.5~10 -6/K, an average crystal size of the .beta.quartz solid solution of ~ 80 nm, and, a transmission (sample thickness 4 mm) ~380-780 nm of < 30%. The glass-ceramic may be, preferably used as a heatable plate for cooking and grilling …
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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 February 16, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 16, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 16, 2022.
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Timeline
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