Dental product
CA 2220161 C · Owner: Unilever Plc · Inventors: Ryles, Christine Watson; Barrow, Stephen Roy; Williams, David Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dental product is provided packaged in a telescopically arranged multi-cavity dispensing container having at least two cylinders in an upper bodythereof. Peroxide and baking soda are placed as active ingredients in separate respective semi-solid streams, each stream being in separate ones of the cylinders. Uniform dispensing of each stream to deliver relatively equivalent ribbon length of each stream by incorporating a synthetic linear anionic polycarboxylate or a polyphosphate to adjust viscosity. Preferred polycarboxylates are homopolymers of acrylic methacrylic and maleic acids, most especially a copolymer of vinyl methyl ether and maleic acid or anhydride and preferred polyphosphates …
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 31, 1997 and granted December 30, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 31, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2019.
- 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.