Process for preparing aspartates
CA 2540588 C · Owner: Bayer Materialscience Llc · Inventors: Wayt, Terry D.; Roesler, Richard R.; Long, Brian
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 aspartates of the formula wherein the variables R1, R2 R3, R4, R5, R5', R6, R6' X a , and b are as defined in the claims. A method of production and the use of these mono-and polyaspartiates as reactive components for polyisocyanates in two-component polyurethane coating compositions and for preparing polyurethane prepolymers is also disclosed.
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 September 27, 2004 and granted July 17, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 27, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 27, 2026.
- 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.