Sol-gel process for the production of glassy articles
CA 2515531 A1 · Owner: Boara, Giulio · Inventors: Boara, Giulio; Costa, Lorenzo; Sparpaglione, Massimo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Glassy articles are prepared by subjecting to hydrolysis and policondensation a solution or suspension of a suitable precursor mainly comprising a silicon , alkoxide and by drying the obtained gel in a pressure chamber the gel , solvent having been substituted by a non-protic solvent mainly acetone, under , nitrogen flowing at temperature and pressure conditions lower than the gel solvent critical values. The dried gel is then densified by a thermal treatment.
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 December 23, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 23, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 23, 2025.
- 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.