Cured unsaturated polyester-polyurethane highly filled resin materials and process for preparing them
CA 2251878 C · Owner: Mushovic, John N. · Inventors: Mushovic, John N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a rigid or semirigid filled resin , material having a continuous phase which is a matrix containing a complex cross-linked network having an unsaturated polyester-polyurethane containing resin having fine multisize reinforcing particles and dispersed filler particles dispersed therein. The polyester-polyurethane network of the complex cross-linked network may interact with other polymer networks in the continuous phase either by cross-linking or by forming an interpenetrating polymer network. The complex cross-linked network immobilizes the fine multisize reinforcing particles and reacts with at least a surface layer of the dispersed filler …
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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 April 14, 1997 and granted August 13, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 14, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 14, 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.