Formation of oligomeric or organophosphorus compositions with improved color
CA 2384267 A1 · Owner: Akzo Nobel N.V. · Inventors: Stowell, Jeffrey Kent
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An aryl group containing phosphite, such as triphenyl phosphite can be added , to a reaction mixture comprising an organophosphorus compound phosphorus , pentoxide and an alkylene oxide optionally in the presence of a reagent for the incorporation of hydroxy functionality in the final product. The aryl group containing phosphite is employed to improve the color characteristics of the resulting oligomeric organophosphorus composition.
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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 July 4, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 4, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 4, 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.