Polymeric basic aluminum silicate-sulphate
CA 2033151 C · Owner: Eaglebrook, Inc. Of Canada/Eaglebrook, Inc. Du Canada · Inventors: Haase, Dieter; Spiratos, Nelu; Jolicoeur, Carmel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polynucleate aluminum hydroxy silicate-sulphate compound (PASS) having the following average composition: Al A(OH)B(SO4)C(SiOX)D(H2O)E, wherein, A is 1.0; B ranges from 0.75 to 2.0;, C ranges from 0.30 to 1.12; D ranges from 0.005 to 0.1;, X is greater than 2.0 but less than or equal to 4.0 such that 3 = B + 2C + 2D (X-2);, E is larger than 4 when the product is in aqueous form. The compound is useful for water treatment and other applications where an aluminum hydroxide gel system is required but the, compound is especially useful as a drainage and retention aid and size promoter for use in papermaking. The compound in, aqueous solution, has a long storage life.
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 December 24, 1990 and granted May 9, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 24, 2012.
- 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.