Process for preparing a branched polymer
CA 2402349 A1 · Owner: Plum, Bartholomeus Johannes Margretha · Inventors: Plum, Bartholomeus Johannes Margretha; Loontjens, Jacobus Antonius
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for preparing a branched polymer by contacting a monofunctional or difunctional polymer whose functional group is at least an -OH or an -NH2 group with a multifunctional compound RYn where n , > 2 and Y is an -OH group, an -NHm group where m=1,2 or a -COOH group and R is an alkyl, an aryl group or a cyclic group and in which the Y groups need not be the same and in which carbonyl bislactamate is also present.
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 March 9, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 9, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 9, 2023.
- 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.