Method for fabricating silica glass
CA 2243879 C · Owner: Oh, Jeong-Hyun · Inventors: Baik, Young-Min; Oh, Jeong-Hyun
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for a fabricating a silica glass was provided. The method includes the steps of adding silica and a dispersant to a premix solution obtained by dissolving a monomer for acrylic resin and a cross-linking agent in a distilled water, and dispersing the mixed solution and adjusting the pH of the mixture, to form a sol; removing air bubbles from the sol and then aging the resultant sol;adding a polymerization initiator and a catalyst to the aging-treated sol and, adjusting the pH of the reaction mixture; pouring the reaction mixture into a mold and then gelating the mixture; aging the obtained gel; demolding the aging-treated gel, and then drying the demolded gel; thermally-treating 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 27, 1998 and granted July 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 27, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 27, 2020.
- 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.