Di- and polyamino compounds for use in the preparation of polyurethanes
CA 2114577 A1 · Owner: Imperial Chemical Industries Plc · Inventors: Carter, Steve; Van Essche, Gonda
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Bis(aminophenoxy)methanes alkyl-substituted derivatives thereof and modified DADPM derived thereof; and conversion of these compounds into polyols and into polyisocyanates, which in turn can be used in the preparation of polyurethanes.
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 January 31, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 31, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 31, 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.