Dentifrice compositions
CA 2198856 C · Owner: Rice, David Earl · Inventors: Rice, David Earl
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Oral compositions, such as oral gels and toothpastes containing a novel , abrasive. A dentifrice composition comprising: (a) a precipitated silica said , precipitated silica being a low structure precipitated silica having a narrow particle size range distribution of soft particles and having a mean particle size ranging from 8 to 14 microns, preferably from 7 to 11 microns an oil , absorption ranging from 60 to 120 cc/100g and a mercury intrusion (HGI) void , volume of 1.0 to 4.0 cc/g; said precipitated silica when formulated into a , dentifrice, having a Pellicle Cleaning Ratio (PCR) from 70 to 140 and a Radioactive Dentin Abrasion (RDA) value of from 60 to 130; and wherein the ratio …
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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 September 25, 1995 and granted December 5, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 25, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 25, 2017.
- 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.