Silica capable of being used in toothpaste compositions
CA 2257184 C · Owner: Amiche, Frederic · Inventors: Dromard, Adrien; Amiche, Frederic
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention discloses an abrasive precipitation silica useable in toothpaste compositions said silica having a BET specific surface ranging from 15 to 300 m?2¿/g a DOP oil absorption ranging from 40 to 160 ml/g a median particle diameter of at least 10µm generally ranging from 12 to 30µm, a particle cohesion factor of at least 85 % about for a median particle diameter ranging from 12 to 20µm. Method for preparing silica by reacting an alkaline metal silicate with an acidifying agent to form a silica slurry, separating and optionally drying the recuperated silica suspension the operation for forming the slurry being effected according to the following steps: a first step consisting in …
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 4, 1997 and granted May 13, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 4, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 4, 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.