Silicon for toothpaste compositions compatible with metal cation
CA 2015921 C · Owner: Persello, Jacques · Inventors: Persello, Jacques
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 silica compatible with metal cations: zinc tin, strontium and others. The silica of the invention is particularly well suited to the preparation of toothpaste compositions containing the said cations. One preparation process consists in reacting a silicate with an acid producing a silica suspension or gel. An initial curing is carried out at a pH of greater than or equal to 6 and less than or equal to 8.5 followed by a second curing at a pH of less than or equal to 5Ø The silica is separated and submitted to hot-water washing until an aqueous suspension is produced the pH of which measured on a suspension at 20% SiO2 is determined by the following equation: pH = d …
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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 May 2, 1990 and granted December 29, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 2, 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.