Prebrushing pyrophosphate-containing liquid oral compositions
CA 2074679 C · Owner: Doran, William T. · Inventors: Doran, William T.; Tricca, Robert E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A liquid oral prebrushing composition for loosening and removing plaque present on dental surfaces comprises dialkali metal pyrophosphate salts, tetraalkali metal pyrophosphate salts or mixtures thereof together with, sodium lauryl sulfate in amounts effective for removal of plaque when the composition is applied to dental surfaces.
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 July 27, 1992 and granted September 15, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 27, 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.