Blocked polyisocyanates containing phenolic groups
CA 2394339 A1 · Owner: Rosthauser, James W. · Inventors: Rosthauser, James W.; Miller, Todd R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to novel blocked polyisocyanates that are soluble or dispersible in water and which contain phenolate anions in a chemically bound form as groups which provide their solubility or dispersibility. It also relates to a process for the preparation of these blocked polyisocyanates in the form of a solution or dispersion in water optionally in the presence of coreactants and to their use as hardeners in , two-component lacquers binders and/or adhesive formulations.
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 December 8, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 8, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 8, 2022.
- 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.