Aqueous suspension based on alkaline aluminium polysulphate, preparation method and use in the field of building materials
CA 2305486 C · Owner: Rhodia Chimie · Inventors: Prat, Evelyne; Chane-Ching, Jean-Yves; Touzet, Sylvie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns an aqueous suspension comprising: A) silica and/or alumina particles; and B) a compound of global formula (I): Al(OH)a(SO¿4?)b(SiOx)c(Y)¿d? with: a ranging between 0.4 and 2; b ranging between 0.3 and 1.35; c ranging between 0 and 0.1; d being more than 0.05; Y selected among the alkaline and alkaline-earth metals; x ranging between 2 and 4 and its derivatives. Said compound (B) being present in the suspension at a concentration of at least 1.65 mol/l expressed in aluminium mol derived from said compound. It also concerns a method useful for preparing said suspension and their uses in the field of cement pastes mortars and concrete and particularly as setting and …
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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 October 5, 1998 and granted July 29, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 5, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 5, 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
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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.