Aqueous two-component polyurethane-forming compositions and a process for their preparation
CA 2072693 C · Owner: Markusch, Peter H. · Inventors: Rosthauser, James W.; Tirpak, Robin E.; Markusch, Peter H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a process for the preparation of an aqueous two-component polyurethaneforming composition by, a) dispersing in water a polyisocyanate which has an isocyanate content of at least 12% by weight and b) also blending with water either before during or after, dispersing the polyisocyanate a polyhydroxyl compound, which, i) has a molecular weight of 62 to 10,000 ii) contains at least two hydroxyl groups iii) is water soluble or water dispersible iv) does not contain urea or urethane groups and v) is selected from the group of polyesters polylactones, polycarbonates, polyethers polythioethers, polyacetals, polyether esters polyester amides and polyamides, …
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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 June 29, 1992 and granted April 22, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 29, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 29, 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
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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.