Aqueous silicon resin emulsion for waterproofing building materials
CA 2257914 C · Owner: Goubet, Sandrine · Inventors: Prince, John; Baker, Gary; Goubet, Sandrine
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The emulsion comprises: 1) at least one resin M¿.alpha.?D¿.beta.?T¿.gamma.?Q¿.delta.?(OR)¿.epsilon.? (I) where: M=R?1¿R?2¿R?3¿SiO1/2 D1 = R?4¿R?5¿SiO2/2 T = R?6¿SiO3/2 Q = SiO4/2; 2) the reaction product between: 2a) one or several aromatic amines or polyfunctional aliphatics from 2 to 25 carbon atoms; 2b) one or several carboxylic acids or anhydrides containing 3 to 22 carbon atoms; 2c) at least one cross-linking agent which is a water-soluble metal complex. The invention is useful for waterproofing surfaces in particular building materials paricularly stone cement, concrete, mortar, bricks, tiles wood, in which the above emulsion is used.
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 June 5, 1997 and granted June 3, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 5, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 2019.
- 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.