Chain extender useful in the manufacture of polyurethanes and the corresponding polyurethanes
CA 2521709 C · Owner: Huntsman International Llc · Inventors: Lindsay, Chris Ian; Woutters, Steve
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a novel chain extender which is a diamino-substituted heterocycle of formula (I), and its use in the manufacture of polyurethanes (PUs), the PUs thus obtained, reactive compositions containing said chain extender, and processes for manufacturing PUs. The formula (I) is represented as follows:
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 March 25, 2004 and granted May 7, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 25, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 25, 2026.
- 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.