Tooth whitening material and method of whitening teeth
CA 2434087 C · Owner: Shermann, James M. · Inventors: Peterson, Kenneth S.; Shermann, James M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dental tooth whitening material sets to a rubber-like or elastomeric consistency. The material includes hydrogen peroxide. A method of whitening teeth employs such a material by placing it into a dental tray a backing , sheet or by placing the material directly onto a tooth. Once the material has set to its solid or semi-solid consistency the dental tray, if employed, can , be left in place or removed.
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 January 25, 2002 and granted October 29, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 25, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 25, 2024.
- 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.