Dentifrice compositions
CA 2000464 C · Owner: Doel, Geoffrey R. · Inventors: Alexander, Stephen E.; Edwards, Peter J.; Doel, Geoffrey R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The problem of formulating a dentifrice which is compatible with a bis-biguanide anti-bacterial agent for instance chlorhexidine or alexidine is solved by, using a nonionic thickening agent; a nonionic surfactant; and an abrasive which is either a sparingly soluble salt, for instance calcium carbonate (used in, combination with an agent to suppress anion formation) or an essentially insoluble compound, for instance a, silica of low anion content, or a mixture thereof. Preferably the composition has a flavour which is mainly aniseed, balanced by mints. Preferably during the preparation of a silica containing dentifrice chlorhexidine and saccharin are added together at an early stage, prior …
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 October 11, 1989 and granted September 16, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 11, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 11, 2011.
- 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.