Method for the production of opaque quartz glass, sio2 granulate suitable for use in performing the method and a component made of opaque quartzglass
CA 2395501 A1 · Owner: Werdecker, Waltraud · Inventors: Fabian, Heinz; Gertig, Udo; Leist, Johann
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for the production of opaque quartz glass wherein a blank is made from synthetic SiO2 crystals and heated to form a blank body made of opaque quartz glass at a given vitrification temperature. A method for the production of pure, opaque quartz glass is disclosed wherein said quartz glass has a homogeneous pore distribution and a high density a , high viscosity and a lower tendency to devitrify. According to the invention the SiO2 crystals are formed from an at least partially porous agglomerate of SiO2 primary particles (21; 31) having a specific surface (according to BET) between 1.5 m2/g and 40 m2/g with a stamping density of at least 0.8 g/cm3. …
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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 December 14, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 14, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 14, 2022.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.