Polyisocyanate composition
CA 2037378 C · Owner: Huntsman Ici Chemicals Llc · Inventors: Duber, Ernst O.; Donaldson, Ronald R.; Murray, William I.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A stable polyisocyanate composition containing from 3% to 30% by weight of trimerized isocyanate, from 25% to 55% by weight of diisocyanates, the remainder being higher functionality polyisocyanates, said composition having a Brookfield viscosity of 150 to 100000 cPs at 25°C, an average isocyanate functionality of 2.4 to 3.0, an NCO group content of 26% to 31%, and having an infrared absorption peak at 1410 cm-1 whereas the ratio of the height of said absorption peak at 1410 cm-1 to the height of the infrared absorption peak at 1610 cm-1 is of at least 0.8.
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 February 28, 1991 and granted April 16, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 28, 2013.
- 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.