Polyaspartate resins with improved flexibility
CA 2442397 C · Owner: Bayer Materialscience Llc · Inventors: Vargo, Michele E.; Britsch, Catherine M.; Gertzmann, Rolf
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 polyaspartates corresponding to the formula, (see formula I) , wherein X1 represents the residue obtained by removing the amino groups from a polyether polyamine having a functionality of n and a number average molecular weight of less than 600 wherein the , amino groups are attached to primary carbon atoms and the ether groups are separated by at least two carbon atoms R1 and R2 are identical or different and represent organic groups which are inert to isocyanate groups at a temperature of 100°C or less, R3 and R4 are identical or different and represent hydrogen or organic groups which are inert towards isocyanate groups at a temperature of 100°C or …
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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 September 24, 2003 and granted January 17, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 24, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 24, 2025.
- 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.