Polyisocyanate mixture
CA 2069465 C · Owner: Imperial Chemical Industries Plc · Inventors: Thorne, Stephen J.; Backhouse, Alan J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyisocyanate mixture which is emulsifiable in water comprising;, (i) An isocyanate functional oligomer which is the, reaction product of;, (a) a polyisocyanate having tertiary isocyanate groups and, (b) a hydrophilic polyether having a group which will react with tertiary isocyanate groups, and, (ii) a polyisocyanate having tertiary isocyanate groups. The polyisocyanate mixtures can be used with suitable film-forming polymers to make aqueous coating compositions.
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 May 22, 1992 and granted May 26, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 22, 2014.
- 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.