Dentifrice compositions containing .beta.-phase calcium pyrophosphate, an anticalculus agent, and fluoride
CA 2235470 C · Owner: White, Donald J. Jr. · Inventors: White, Donald J. Jr.; Cox, Edward Russell
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are dentifrice compositions comprising from about 30% to about 45% of .beta.-phase calcium pyrophosphate an anticalculus agent, a soluble, fluoride ion source capable of providing from about 50 ppm to about 3500 ppm of free fluoride ions, and one or more aqueous carriers. The anticalculus agent may be a polyphosphonate source, a polyphosphate source or a, pyrophosphate source.
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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 April 21, 1998 and granted March 5, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 21, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 21, 2020.
- 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.