Dentinal desensitizing compositions
CA 2085975 C · Owner: Fertel, William S. · Inventors: Lim, Richard M.; Fertel, William S.; Herms, James K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition containing a water soluble or water swellable polyelectrolyte or salts thereof in a dentifrice base or other oral compositions which can be used for relieving pain and discomfort caused by hypersensitive teeth. The salts can be single or mixed partial salts of the polyelectrolyte.
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 December 21, 1992 and granted March 30, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 21, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 2014.
- 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.