A dentifrice composition comprising a soluble calcium sequestering agent
CA 2539170 C · Owner: Block Drug Company Inc. · Inventors: Creeth, Jonathan Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An dentifrice composition is disclosed comprising a soluble calcium sequestering agent that is not an oxidising agent wherein the composition has , an RDA value of below 30 and an IVSR value greater than 50 (when compared to a Control) and an orally acceptable vehicle wherein the calcium sequestering , agent is present in a proportion of 1-20 wt % and the abrasive is present in a proportion of 0-5 wt % of the composition. The composition is highly effective in removing stains from natural teeth and prosthetics and will not damage the tooth or prosthetic due to excessive abrasion.
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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 21, 2004 and granted June 26, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 21, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 21, 2026.
- 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.