Color stable dental restorative materials
CA 2176322 C · Owner: Jia, Weitao · Inventors: Jia, Weitao; Prasad, Arun
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a polymerizable dental restorative resin composition useful as a dental composite resin and/or a denture/denture base material comprising at least one binder resin a diluent monomer, at least one filler optionally, a photopolymerization system comprising an initiator for initiating polymerization of the composite resin upon exposure to visible light and an accelerator, and an initiator for initiating polymerization of the composite resin upon application of heat, the improvement imparting shelf stability and substantially eliminating discoloration is provided comprising the initiator for initiating polymerization upon application of heat having the general formula: R-N=N-R', wherein R …
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 May 10, 1996 and granted October 12, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 10, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 10, 2018.
- 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.