Isoxindigos useful as colorants and preparation thereof
CA 2280867 A1 · Owner: Jandke, Joachim · Inventors: Nesvadba, Peter; Jandke, Joachim
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 a process for coloration of a high molecular weight material by admixing said high molecular weight organic or inorganic material, preferably high molecular weight organic material prior to , processing with at least one compound of formula (I) where A1 and A2 are , independently unsubstituted monosubstituted, disubstituted, trisubstituted or tetrasubstituted o-C6-C18arylene. The invention further relates to compositions of matter comprising isoxindigo compounds and high molecular weight organic material. The invention also relates to processes for preparing the compound of said formula and also to novel isoxindigo compounds which can be symmetrical …
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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 August 29, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 29, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 29, 2020.
- 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.