Method for preparing raw materials for glass production
CA 2462677 C · Owner: Saint-Gobain Glass France · Inventors: Jeanvoine, Pierre; Le Verge, Arnaud
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a manufacturing method based on alkali and/or alkaline-earth and/or rare earth silicate(s) optionally in the form of mixed silicates associating at least two of said elements the method comprising: (i) preferably a reaction converting (1) halides of said alkalis and/or alkaline-earths and/or rare earths into corresponding sulphates, and (ii) a reaction converting (2) said sulphates with silica into corresponding silicates the thermal input required for said conversion being supplied at least partly, by a combustion reactor (3) using one or several immersed burner(s).
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 October 4, 2002 and granted December 4, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 4, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 4, 2024.
- 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.