Method for improving the strength and impermeability of soils and engineering structures
CA 2001981 C · Owner: Gal, Andras · Inventors: Nagy, Gabor; Danko, Andras; Szekely, Tamas
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 improving the strength and impermeability of soils and engineering structures by forming a silicate gel. According to the invention one proceeds in such a way that, - an alkaline water glass solution comprising water glass in an amount of 15-40 % by weight calculated as dry substance optionally together with one or more natural or synthetic oligomer and/or polymer in an amount not exceeding the dry substance content of the water glass solution and, - a silicic acid sol comprising SiO2 in an amount of 5-50 % by weight, preferably 10-45 % bg weight calculated as dry, substance in which 10-100 % by volume of the dispersion medium consists of a …
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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 November 1, 1989 and granted March 4, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 1, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 1, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.