Cured unsaturated polyester-polyurethane hybrid highly filled resin foams
CA 2185894 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 lightweight filled resin foam having voids dispersed in a continuous phase which is formed from a polyester hybrid resin having reinforcing particles dispersed therein. The hybrid resin forms a complex cross-linked network (20) which may interact with other polymer networks in the continuous phase either by cross-linking or by forming an interpenetrating polymer network. The present invention is also directed to a process for preparing the above rigid, lightweight resin foam and to a composition for use in, this process. The foam of the present invention is useful in building materials and the like requiring high tensile and compressive strength …
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 April 8, 1994 and granted June 26, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 8, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 8, 2016.
- 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.